Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f7a718328c4473…

MALICIOUS

PDF

71.3 KB Created: 2021-02-19 15:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fbbce53eec61857012043aa493eab0f0 SHA-1: 89ee1d9a0e4e86fd73c247a4f0924414d5128d85 SHA-256: a3f7a718328c4473234b4e93bf64eabc7f9d324b74e2f2da12a7df7d4e0f6e10
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's likely used as a lure, potentially leading to further exploitation.

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://druttle.ru/strik?utm_term=how+breath+becomes+air PDF link annotation
    • http://sellforce.ru/71349980158iab8r.pdfIn PDF document text
    • http://clientbluebadge.com/87772917506nob75.pdfIn PDF document text
    • http://the-job.ru/ups_apc_back_550va_330whq6zu.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/gjsjoij/milk_chocolate_recipe_from_scratch.pdfIn PDF document text
    • http://trendmobile.ru/fezononitumonurefuxotalxjqcb.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/377725593118ojj8.pdfIn PDF document text
    • http://biomanix.best/ben_10_alien_force_game_download_for_pcpv8b2.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/tijdxji/53332370271.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/geEvMks/game_zombie_evil_2_apk.pdfIn PDF document text
    • http://zaximudetebase.iblogger.org/zabozatogix.pdfIn PDF document text
    • http://quinzsy-studio.design/42303031758qgg6s.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/iijb0tZ/41386662382.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/4ghhWhe/hollywood_action_movies_2015_you_tube.pdfIn PDF document text
    • http://mijuxub.66ghz.com/latest_android_mobile_phones_below_20000.pdfIn PDF document text
    • http://krepezh.guru/babushka_boi_music_videoulv4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 5200 bytes
SHA-256: 839f19f195ab73ebd92737cb9de911d3ec3800b2bf4afe2905434d62129645de
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 10724 bytes
SHA-256: 72dcd398cbf9be79dd3cdddc2cc899750f67644199e6a31b8a0672a926815c63

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