Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5f38271b46d559…

MALICIOUS

PDF

93.9 KB Created: 2021-04-02 20:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9e6d4852882a7cf6cbffa701e0cc6ebf SHA-1: 10edebbc224d119cce68a9210c83412cd293adbd SHA-256: 1a5f38271b46d559df1b3e6c84c54b7e8f154436df3f9fa59ca670d21e9cb934
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://kuzutuzo.ru/strik?utm_term=what+are+the+ethics+in+psychological+testing PDF link annotation
    • http://nogurufegu.mygamesonline.org/harman_kardon_avr_1700_manual_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6016c87ced5c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_605ac068cc9b5.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/social_security_act_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_600e47bf59a5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/300cd0c8-21ff-40d8-9438-c8ede40a13a3/kitchenaid_superba_fridge_ice_maker_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb58a77-9458-464f-9e25-48f7bd4b1d95/honeywell_thermostat_blank_ac_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da198372-3717-43b0-8ec3-9367be2c40b7/how_to_do_mind_maps_for_studying.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/53058515536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76bcab34-ee32-43d7-b9c8-4e3f1a5f274c/60314740381.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_e793343195aa4edba9a7d2dd98ccd1b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4abacf6-1ba5-4393-9653-dc2bac22cb0c/minolta_maxxum_7000_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98120201-60fd-4bc7-8af5-d03e3d8f2868/92166738330.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_a21a78cefca24b67ae9318b6f0b55e26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/girixavogatepefaw.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_ef5f674d26444f618a93e5366551c4ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0e91db-2f77-48ba-a7f0-6b50c32dd135/dowobefusunik.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_off00013320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 5308 bytes
SHA-256: 3aa6ec3b9eb7717ed83c535ce7a67d7520d01d2770c550db55571711ff5d1e0a
font_01_sfnt_off00014542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14542 10928 bytes
SHA-256: c76fcc6aa5efd2f544c0ded12c4959a6a29e37f2d0fd15fa258e95ae29fbc849

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