Malicious PDF — malware analysis report

Static analysis result for SHA-256 f850522ffac8d956…

MALICIOUS

PDF

77.8 KB Created: 2021-03-20 06:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 77ac43b76e31cdd67a63a969a8931cd3 SHA-1: 11a336b31e6a75d2bc6a6c0a260df3fc449fafab SHA-256: f850522ffac8d9563b12b4b4f40e1dce1db64f2fb6ae7a488685c173eabd553f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further indicate maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

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://ponafet.ru/strik?utm_term=how+to+call+someone+back+if+they+have+no+caller+id PDF link annotation
    • http://noksipals.online/corsair_cx750m_cableskdy0w.pdfIn PDF document text
    • http://marketitaly.pro/19671756332komi1.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/Sjahigj/destiny_s_child_survivor_album_cover.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/lomosepepux-monafimogu-fizadilezi.pdfIn PDF document text
    • https://vusugurubem.weebly.com/uploads/1/3/0/9/130969976/kebef-badonizox-fevasos-mosobotax.pdfIn PDF document text
    • http://big-ita.space/word_for_hospital_roomamk2s.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/Xi4vxKs/47482141188.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/WEhhhaZ/defender_arcade_game_ios.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/temevadatakegural.pdfIn PDF document text
    • http://instasale.company/pevofam5juz0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fadedosi/child_s_play_1998_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/tijor.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/batman_the_dark_knight_rises_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/1511585992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76287497-8062-483b-985f-87eb9d98ca8e/fidonironiluzifuvabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6391ebfd-27a9-4ea5-afd5-6950d3ab6d70/kuvejubafofovijoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8ee35e-4901-4731-be10-0dad810ff884/how_to_start_drawing_on_procreate.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 5468 bytes
SHA-256: 658e7dec3f52323411f5db2a81fe7c54d34e1c97e3d4da37c967053c91cc7446
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 11104 bytes
SHA-256: 1b812784baafeae1d5d9e6e4401021436e3e184b7de4602fa85c8c17088b7603
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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