Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9902a9dc51d1017…

MALICIOUS

PDF

94.9 KB Created: 2021-04-03 03:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c309c377be132c59b9be0ebc2f890834 SHA-1: 086f304f9d534b4eb04c64f38e7fe292306a0acf SHA-256: b9902a9dc51d1017005464956540cfa4b04d4d22c0a758b39e87fd1e2532c9b7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, with many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The embedded document body text is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to redirect users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://lokejarezuwomi.weebly.com/uploads/1/3/0/7/130776656/2129987.pdf In PDF document text
    • https://bifotuvimutojuz.weebly.com/uploads/1/3/0/9/130969437/tijogexiribitarapal.pdfIn PDF document text
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/5e49d5f2.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/5716917.pdfIn PDF document text
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/radetoda_wasupigarog.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/8891954.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/3677416.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bQ3nTxENlgE/wb?keyword=is%20divergent%20ascendant%20on%20netflix%20usaPDF link annotation
    • https://uploads.strikinglycdn.com/files/7d27a540-89e8-4f88-941a-d09909c89ba2/how_to_apply_cast_member_discount_on_shopdisney.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9c7080-ffc0-4070-b7ad-32c64cd713d9/fisowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63fdf3f4-7e44-4523-9ac2-36e1dfc2649b/monagelozumudurekikufitaw.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_b77da54dd06341dcb953c2a1a1abfcea.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_a975683e6a19467e8636fd53a7b4b4f2.pdf?index=trueIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_20409322dd784094990777c4445c486a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afda9f1c-5d2e-48f4-a7d0-cc88237f6946/is_steamunlocked_safe_2021.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_f85878cd6fa94ed4923263849ad12809.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_ae00a6beb97f4109930e3be03dd42078.pdf?index=trueIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_fb6bec5f41b845c5b5d4f740672fbad8.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_011932734d3c43429d44010d6de1dca6.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_6692c7fa5d25461c8ede5649bde0bd25.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_193b23fc8dab4455ba108f126cf2fbc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/893f331a-0b94-432b-999f-bc7c66e170c0/how_old_do_you_have_to_be_to_go_to_planet_fitness_for_free.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_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 5256 bytes
SHA-256: 7ef9c62bccd074716e0f4c967b1bc031453ee8167114bef3cd4719b11032bd31
font_01_sfnt_off0001435c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435C 12232 bytes
SHA-256: c0ce3f98f1dedd02c08982dac1e58897cf61f0843240db0dfc1758d7ad6b4bd9