Malicious PDF — malware analysis report

Static analysis result for SHA-256 138f79b26a2011e8…

MALICIOUS

PDF

76.8 KB Created: 2021-02-02 14:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2c600b1decb9bdd884f6ed9c1677b0f5 SHA-1: 4c114f8caba97fd71978bb7ddfba3121fa1bc924 SHA-256: 138f79b26a2011e84a1e4bd415142df4d07eafe74618e4d568d761fb82579b78
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://bologen.ru/aws?utm_term=math+worksheets+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392442/normal_601678385068d.pdfIn PDF document text
    • http://mabirimelu.iblogger.org/kcet_2019_maths_answer_key.pdfIn PDF document text
    • http://albl.ru/spirit_airlines_check_in_timesut96.pdfIn PDF document text
    • http://worldthailand.fun/berserk_chapter_362_release_datevx812.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jeU9ifS/free_online_digital_timers_for_classroom.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/0jcjgha/artists_who_sang_mr_bojangles.pdfIn PDF document text
    • http://bajelow.iblogger.org/73538065364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_5fd814151d16a.pdfIn PDF document text
    • http://yoganchik.space/3443042459760w2m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pogifovemujure.epizy.com/emulator_gba_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/nasejus.pdfIn PDF document text
    • http://debetofewozuri.epizy.com/cast_away_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/patowes.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/birthright_israel_contact_information.pdfIn PDF document text
    • http://fonumelipo.rf.gd/bodybuilding_workout_program.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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 5256 bytes
SHA-256: 5a42ebdb5fa0f485a93539ca5c236676147894e99142d6b3b636b241fb7ee912
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10696 bytes
SHA-256: 456fa0a81e516ca7543b45ed945d6271703d0b7cd12199a46f2e762676dcff5a

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