Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2b1dcc0d679c31…

MALICIOUS

PDF

82.9 KB Created: 2021-02-18 09:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b7f0e1f13b73e66991414d76c6a10919 SHA-1: a876cb7d8649d1707ee35dc85e05ae881bf0a641 SHA-256: dd2b1dcc0d679c317364cbcfba1ddfde2c096601c89ee2bb02ed0a5debc7ff0e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with the primary one being https://jacksth.ru/wix?keyword=graphing+parabolas+worksheet+1, suggesting a lure to a malicious site. The document's structure and embedded links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=graphing+parabolas+worksheet+1 PDF link annotation
    • http://priz24.site/39276375417zcb7d.pdfIn PDF document text
    • https://winakafefumo.weebly.com/uploads/1/3/1/3/131397983/pajosasafero.pdfIn PDF document text
    • http://dfds.in/multimedia_player_for_mac_freezeamb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5fdc8b7950789.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/WgjKyv5/launchpoint_teacher_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_6014177b95a44.pdfIn PDF document text
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/219fa966f.pdfIn PDF document text
    • http://healthytrands.com/antihero_meaning_in_tamilg746n.pdfIn PDF document text
    • http://keto-s1.com/probability_and_statistical_inferencqo3oa.pdfIn PDF document text
    • http://yesnutural.space/adding_fractions_grade_5_worksheets29qa1.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/tejuvonixag/renovosenibog.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/28505562775.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_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 5460 bytes
SHA-256: 3e4ed85e5c2f1095fcc50c307900db8daccd8844c588c531b1727189a1e1be73
font_01_sfnt_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 15268 bytes
SHA-256: cca7d3437e978e4170a25c60679222a45266c597b81d4fcdf1001203b8637dc7

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