Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd3dd706ba39b98…

MALICIOUS

PDF

73.8 KB Created: 2021-02-23 23:34:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 89f2eda1b38e37b01d357c3ed9b53d4b SHA-1: 7a64bd1c1cb9eb16033f17c38984343347522985 SHA-256: bdd3dd706ba39b98cd4102e7d3dfb090405f0e7483eec79e2760e13cca182276
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF's nature points towards a phishing or malware distribution vector.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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+long+do+french+students+go+to+school PDF link annotation
    • https://cdn.sqhk.co/fopikudapom/dTrFhcj/fijaramivumivopulujoba.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/chijejb/pixel_s_unknown_battleground_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/tiejivt/tilusefisulufudiro.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/jaDiahj/parkour_jumping_training.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_6001e4af84c75.pdfIn PDF document text
    • https://cdn.sqhk.co/lerotakisisa/iigfujg/16939310362.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/nenadivosefipewow.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/qkjdqab/71976492403.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/WnGTgcs/zombie_age_2_premium_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60143e2392415.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/ac0jcja/soriputuzaduromumapof.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/gd91Tjc/mebutukewodabixefidon.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/hhdQiaI/48536612536.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/toguvaju/livolatumenezow.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/kokifekakujinakubuwut.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/cluster_headache_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/movajowakidiz.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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 5124 bytes
SHA-256: 75b86edb9dc6fc1c25e548d943235e7a60dcff68c59eb191c188a911a1027a95
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 10892 bytes
SHA-256: d1e242ef293a0bad91b1ddf605630567749dfac01b8264b756897004675b761b

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