Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b29f52efa1062cc…

MALICIOUS

PDF

81.8 KB Created: 2021-03-23 20:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 30e075dd9b53cf9c5d39f6f0a6e4fdaa SHA-1: d7a4d526ea6da62335f4c82dc27d115d338bd649 SHA-256: 1b29f52efa1062ccb936e53fd6d2288a31d3a9f467bbf399ec80bc8b0350d326
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+install+rv+toilet+seal In PDF document text
    • https://cdn.sqhk.co/gobuwovuv/hbgjplj/clouds_movie_director.pdfIn PDF document text
    • http://mrshadow.net/kewerovetizipidel7folu.pdfIn PDF document text
    • http://usesalon.xyz/double_dork_diaries8zhpw.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/cibd6jd/paper_and_moose_videos.pdfIn PDF document text
    • http://fbdirect.site/fegepogokugovuparirumor3ahj.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/butejin-gufavufedepope-bivuwetusurip-xutuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_60322ae95e623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_604d9b41bd4ed.pdfIn PDF document text
    • https://midusafamiriron.weebly.com/uploads/1/3/4/7/134702540/runokinodopurem_fisajemovisedu_reriwaw.pdfIn PDF document text
    • http://lightly.store/64181766593zyyuh.pdfIn PDF document text
    • http://chuvashovfamily.ru/pac_man_arcade_machine9t6pk.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/iX8hdz0/10709579336.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://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_ceed92e3170147caacb0c93a4ea27b07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad874c5-77dc-4021-bc41-e53d8e71e347/63246712693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7329596-baf8-4bd8-bcd4-d209ab68086b/test_on_parts_of_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de11b47a-4fe7-4300-97f6-cd66da806380/7247044571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0acbe58-0e34-41d1-84f7-073c385af1d5/how_to_pair_iworld_wireless_headphones.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_0972e27723fc474f8d9afff352c94260.pdf?index=trueIn 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_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 4580 bytes
SHA-256: bed742d77fadb6a573bf44cc6c72613057902ce2c671398c279a24c168857016
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 10872 bytes
SHA-256: bb73707d4a14eb9bb3eb5a9c0d7e77e834b52ae0552330bff90ae1713daa00df
font_02_sfnt_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176