Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9882e2925bf711…

MALICIOUS

PDF

78.3 KB Created: 2021-04-20 10:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e19dde949590d870e87a024795c4ca4 SHA-1: 18c5219ca23d1c05a0fe056bce14445abd375f88 SHA-256: aa9882e2925bf711f9719cd8acb880a292b8d9cc659c9963267a35ed66b176a7
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://jumiwimov.ru/strik?utm_term=cyberpunk+2077+delay+meme+reddit PDF link annotation
    • http://spainwow.pro/rise_up_singing_book_song_listcd01t.pdfIn PDF document text
    • http://mignonette.space/how_to_do_trig_on_non_right_triangleswh1jn.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/4636030.pdfIn PDF document text
    • https://tufamivobanode.weebly.com/uploads/1/3/0/8/130814219/dofojogagojesi.pdfIn PDF document text
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/1910885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_6057b085d4cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_602a41f278eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_6021d042dada4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5ffe646672b28.pdfIn PDF document text
    • http://securityverifiedservices.com/the_chaos_of_longing_bookk091u.pdfIn PDF document text
    • http://mylevel.store/ive_got_the_sun_in_my_pocket_lyrics9hwzf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411922/normal_5fee01bab04ee.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/ff8b80d1-f1c4-4878-816e-03dbed2ba2e5/how_to_pair_skullcandy_speaker_with_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7232448-38f9-42d4-9e16-de0929581057/jevibatoxogotaxi.pdfIn PDF document text
    • https://92fbd7ca-8480-4723-bb2c-19523f9dca15.filesusr.com/ugd/29946e_f112e9eefad34755b898b2c53503dfb1.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_61c556d18bfa44ddb8808084c83b7963.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adcd906-9a58-4756-aae6-f9a5f7e8c34a/reif_principles_of_statistical_and_thermal_physics_f.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_86d34d629b2e4e5f870c1a0701e8dbbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/544a07bf-4223-46ab-be23-b808faa46782/dragons_of_autumn_twilight_audiobook.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 5492 bytes
SHA-256: f760418d5c204d2e28ab3abbc623a475c7812702679cd62bd36d6d4e3aa22c08
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 10608 bytes
SHA-256: 3e6212b34d602a976eb73df7b47687c111288dbe49a735c377b69e6c050c86e3

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