Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f9c0fbae113a06…

MALICIOUS

PDF

98.0 KB Created: 2021-05-17 20:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3efa045f04b543c0fc43d7ce630afa90 SHA-1: 9f2ee91794b49cf389a43c4ddf8d0243cc821efc SHA-256: 85f9c0fbae113a062653f1ed0d8bae3c9b2a9569c58a6301906c2e068d1d5d9c
166 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 0.9996

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/strik?utm_term=what+they+talk+about+when+they+talk+about+love+review PDF link annotation
    • http://olx-delivery.cc/wexiwutlibm.pdfIn PDF document text
    • http://tramlaweq.online/48670152454aaoq5.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/74922986424.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/maths_formula_booklet.pdfIn PDF document text
    • http://loginwithfb.site/metal_guitar_licks_tabsp4pyl.pdfIn PDF document text
    • http://smartycredit.info/xodujujuxofilih0xsh.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/latugifaxet.pdfIn PDF document text
    • http://antonioit.fun/city_car_driving_game_car_simulator_games_3d02cif.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/nekoxosetokuxoke.pdfIn PDF document text
    • http://my-favshopf.online/98870341614ndlw9.pdfIn PDF document text
    • http://xbet1.fun/demedoxudefafosizemy22sw.pdfIn PDF document text
    • http://rabota-plus.club/doctors_sick_note_templatey18i2.pdfIn PDF document text
    • http://operationhomeplate.com/c_sharp_nullable_reference_typejd7g1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_60374f86a303e.pdfIn PDF document text
    • http://drilltech.info/38439605057rcihn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5ffaa1633c6bc.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/e227f255-14cf-4e78-9369-bebf1a50d7bd/centerpoint_sniper_370_scope_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345916f2-ef83-482c-b213-95d1895286c5/70743909468.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/vosezajegajikitet.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/lesatox.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/age_calculator_apk_app.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_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 5064 bytes
SHA-256: 24a3dd40b862a5bbf7eb5d9615506b9a913c51e545afbcbd1f92999b188d008e
font_01_sfnt_off00015374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15374 10668 bytes
SHA-256: 0f5fece5a99be368dd3f9dd2905ee49d00c0b42259ff1dd24791ee19458d4caa

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