Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f0c9b8db9c3c8c…

MALICIOUS

PDF

79.0 KB Created: 2021-03-28 18:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3c878c199a4eab6f2d6f9c07c70bc782 SHA-1: 52285b2d7eb95a389f1c616570c7a35599b1e104 SHA-256: 13f0c9b8db9c3c8c02e20a2dd370de177cfecfb43e385d228d10236541fb9110
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 0.9998

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://dafemum.ru/award?keyword=assumptions+of+t+test+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497685/normal_6056ed60a0b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_5fdc0c0487f73.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/labilufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_6017bb060b904.pdfIn PDF document text
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/kavewujerapovekinoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitajosasa/guide_to_beating_the_ender_dragon.pdfIn PDF document text
    • http://mobosefevexaxep.rf.gd/how_long_do_water_softeners_last_in_arizona.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/79047368176.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/rubofagiralupidob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f355c97e-6f14-4a6b-8490-a9234a660426/speed_queen_tr5_manual.pdfIn PDF document text
    • http://xonefepuvimami.epizy.com/gmp_certificate_template_ema.pdfIn PDF document text
    • http://dafiwogi.rf.gd/mozomafopowabifopiz.pdfIn PDF document text
    • http://mirowoke.rf.gd/purifeviropekitakod.pdfIn PDF document text
    • http://ponodoveb.rf.gd/the_carpetbaggers_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3326bde2-ecd2-41f6-8c11-cbac827f65d6/seiko_solar_chronograph_black_leather_strap_sne473p1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7918ab6b-3136-407c-8256-f277cc391b64/sedir.pdfIn PDF document text
    • http://tusajemepo.epizy.com/black_and_decker_smart_battery_charger_15_amp.pdfIn PDF document text
    • http://zizowuwekizusim.epizy.com/cashier_resume_sample.pdfIn PDF document text
    • http://fikupamipevow.rf.gd/35962675793.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 4720 bytes
SHA-256: 4aae35675ed44986444fefda6aac11f1f122c46ac1f2b94185387f9a024116f3
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10468 bytes
SHA-256: 4925a18e117e8e6e6b5c1c2b0242a48c17257c772cea68e591c2f65f6daf04d7
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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