Malicious PDF — malware analysis report

Static analysis result for SHA-256 b049e8322d7909fd…

MALICIOUS

PDF

78.5 KB Created: 2021-02-04 07:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d6a354e1bb78d74d24d075d431f80c7b SHA-1: e81a4d1fd4d8e510fc5e8648c299b3ca2a21d13b SHA-256: b049e8322d7909fd4fc618cf378a75c5d08d5d21b561adcf2170ca4901a78f54
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://jacksth.ru/123?utm_term=aua+medical+school+requirements PDF link annotation
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/6696959.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/2c8bdd0ab3ab35c.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/iIshfw3/y8_football_league_sports_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375087/normal_5fe2067de48b4.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/pizemepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5ffc85ffd08be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5fda07936f926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5fd37bf93f8d8.pdfIn PDF document text
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/cb14bab6.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/iiGFBu6/my_gf_started_talking_to_her_ex_again.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/jjrijO5/weather_forecast_2_weeks_los_angeles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_600479caa7e37.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/dHERidI/snow_bros_arcade_machine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befarekogol/libertango_piazzolla_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/64480294241.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/spirit_checked_baggage_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/whirlwind_girl_season_2_sub_indo.pdfIn PDF document text
    • http://dulubuli.rf.gd/kamezumarazegufokideti.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_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 5292 bytes
SHA-256: a0a56c3c47dc2b0c6de36a5c364f0eb69a494515f59097808f2c4a518a4a9c30
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 10580 bytes
SHA-256: b278ad5e1d97ee8358a74dfecc5745201c34f2eff23bedf85a625d53f142e0b5

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