Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05816a2db4c8ea6…

MALICIOUS

PDF

81.5 KB Created: 2021-05-09 04:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8366deae65be678ad557eb131fc26e8e SHA-1: 21fec12c408d2853f44fb4f3e9cff9e95ca1494e SHA-256: f05816a2db4c8ea6969830c6f7921677e7616b86086b4e2dc39ce8b5f4897a7d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. One prominent URL, 'https://gimoguvi.ru/strik?utm_term=quincy+price+in+hong+kong+restaurant', is likely used for phishing or malware distribution. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=quincy+price+in+hong+kong+restaurant PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480161/normal_603d3652d3b64.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/iejcSja/trials_frontier_hack_version_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_6040196e55488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5ffb9f98ade7b.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/hjdIJFc/mini_golf_world_championship_myrtle_beach.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5fe8cc33b884a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403414/normal_5ff3eb5f96774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_606712d0576f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5fe8545d7f7e9.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/hhgjjfg/soap_cutter_game_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381289/normal_5fe443bf81666.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fde81c53a53a.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/cJ7t3o1/mortal_kombat_11_ultimate_price_xbox_one.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_b9d8b86090f04af9a02a4f64bcf4f834.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_02c699f1bbfd4ee58c337167020bacaf.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_cbc5e302e1d84947a3a5d4474b268c46.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_920b6fb911ad43a8b2fd463d7a654c84.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_b0493e692e5949498aa4fad3870ab5cf.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_9ad9320fa1954723bdd98a7000fcd66b.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_272bdb4715d84b54a1e3d918dda0135c.pdf?index=trueIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_66be1a692c054ecd822d3aafd262eda6.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_872e3f3fdb1e47d3ab5693f4f3b1f72b.pdf?index=trueIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_59fbe3be69fd4f6984190f5c1084b6c2.pdf?index=trueIn PDF document text
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_5e5118f43ce5473cbfad4ed65f8636f4.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_c36c8da7b7b245acb80b68eca4b0bc2d.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_f4002ae74bb9477ea05d68cf9678fa0a.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_dd864243af354ea99b084318644839ff.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 5388 bytes
SHA-256: 11be43915ce6fcf28660afd0ba5d1296c045c9bbc5a2e413474595b7fe19f9ae
font_01_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 11336 bytes
SHA-256: fa72ea322505c4a118be8857b7af9b058afbe939aa7f8fbf63e9b98ba946c8ca

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