Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a97e301ab71a5e…

MALICIOUS

PDF

73.8 KB Created: 2021-02-28 00:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d91a38180d0dc60f8268a9f6912e7bd1 SHA-1: 95d3f24532d80d16cbf5667a3f424e9df5dbffb9 SHA-256: c2a97e301ab71a5ea76621c5054a5e6214d491953f379e865aa4b8516b07147c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain keywords related to a 'Trek cycleops magneto trainer manual', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/wix?keyword=trek+cycleops+magneto+trainer+manual PDF link annotation
    • http://topsale.pro/great_dictator_2012_movie5pnef.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/8hgqCGD/grandpad_central_login.pdfIn PDF document text
    • http://itawomen.fun/tefal_nutricook_pressure_cooker_reviewur24e.pdfIn PDF document text
    • http://urott-hu.com/mituvepej22thg.pdfIn PDF document text
    • http://dajexori.mypressonline.com/korozetedox.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/46007016640.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/is_aerospace_engineering_in_demand.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/bodybuilding_food_nutrition_chart.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/welizoromi.pdfIn PDF document text
    • http://replyua.site/is_imagery_a_literary_device8pknz.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/r5vggq6/vatudulebus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medexode.atwebpages.com/briggs_and_stratton_lookup_by_serial_number.pdfIn PDF document text
    • http://rojepubaxogo.epizy.com/71903792182.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/tudunuvuwatoretalirujibud.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/free_printable_1st_grade_comprehension_worksheets.pdfIn PDF document text
    • http://dunetelezosamat.epizy.com/sugomupopixede.pdfIn PDF document text
    • http://foraxevub.rf.gd/benubojenagufuvupa.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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 5368 bytes
SHA-256: aea405cecef28c08830dc3d62cf6337726c860b80b87cd8f2a7b063386b797fb
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 10784 bytes
SHA-256: 3a507f3a53e57054a3682b6bd6c9fe8551a14df0f4a458aa6b729497d4519eb6

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