Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd5bde38c1a3446…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 11:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c34a325381dd85b9fc15263706534e59 SHA-1: 90b2d03ae27a1491424c319c788f40726b917039 SHA-256: fbd5bde38c1a3446f9f803b4ca8c4e78e69440adc4adf76fced831f2ebcb6bec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=allegiant+book+detailed+summary PDF link annotation
    • https://cdn.sqhk.co/vufebevefo/hijdhcE/siroluvarezu.pdfIn PDF document text
    • http://sfhgfje5df.xyz/whats_in_a_name_activity_sheetrdl23.pdfIn PDF document text
    • http://yesnutural.space/aye_axemen_orientationv24b2.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/yNicggr/darkest_dungeon_grave_robber_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_5fea317a23c81.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/lifetime_basketball_rim_installation.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/fhcnCic/no_crop_video_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jbjbhfA/lawovivixiwuno.pdfIn PDF document text
    • http://rmk4sale.xyz/samsung_galaxy_note_30_ultra_pricesb2mh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_602093fe15893.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/icvihdj/zavizinopavutavaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_60013da386872.pdfIn PDF document text
    • http://mandarin-fruit.space/hampton_inn_is_it_pet_friendlyozr7y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_22f4bec181bc4ad0bd36b2c37ce01988.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_2a50fce947ce451db1fd740969c51921.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_d325b33bf19c441e95f6dee973ae8b4b.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_df65eeee4fb047538cb8d291f04471b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ccdf56-c051-4beb-a1d4-1363fadf1c14/what_happens_at_a_psychiatric_assessment_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329621bf-bed0-4ffc-a8e2-f5e06afe5629/maburir.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_3b404a7c3f544383ae34099d9a53507e.pdf?index=trueIn PDF document text
    • http://kofepiropi.onlinewebshop.net/law_on_obligations_and_contracts_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e586f971-55fa-4bbe-846b-becd02c2c4d4/best_mini_stereo_system_2020.pdfIn 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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 5440 bytes
SHA-256: 9002d738ec73b6cecc7ed8080c0719c00d3751c123b36eeaad1c5e3da61e71c9
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 11688 bytes
SHA-256: 79851319483f991058c4480bbe27a98422235429895cb265bb579c85286399b7

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