Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6f53216fb2302f…

MALICIOUS

PDF

75.5 KB Created: 2021-03-23 18:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6c7d0cc7a1320905008a535393bf5fcf SHA-1: 1933911544846ff4665cbcc2dabb889d9de7dd79 SHA-256: cd6f53216fb2302f1f00f30c7e1edc7e7cc5f23fb98ba72f77731c1bcd6f6e12
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://maypoin.ru/wix?keyword=halo+the+essential+visual+guide+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497368/normal_5febfccf77760.pdfIn PDF document text
    • https://rojinotur.weebly.com/uploads/1/3/4/4/134442242/melomexaxa.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/917952.pdfIn PDF document text
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/meramidixikugi-lixirata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_604a9f3d7e3e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5ff712395bef4.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/rojefuti.pdfIn PDF document text
    • https://labegemi.weebly.com/uploads/1/3/4/7/134709462/pukekenomevefu.pdfIn PDF document text
    • https://gavuzidawosowek.weebly.com/uploads/1/3/1/4/131413418/bikevadoputufazo.pdfIn PDF document text
    • https://degijidugaf.weebly.com/uploads/1/3/4/8/134886203/titilezifogil.pdfIn PDF document text
    • https://mixodozom.weebly.com/uploads/1/3/4/3/134333910/2029461.pdfIn PDF document text
    • https://fuxusololozo.weebly.com/uploads/1/3/1/3/131380606/mekakube-rilomaga.pdfIn PDF document text
    • https://nasuzezigoma.weebly.com/uploads/1/3/4/5/134587751/jifutumuxunem.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://uploads.strikinglycdn.com/files/7ef459c2-0da4-4d8f-ab47-717d54f8ac17/which_engineering_is_best_for_indian_navy.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_4d81b44b813a49528e187b672c77b5f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec227769-2418-438f-b5b3-9f8357d77260/best_panasonic_cordless_phone_with_answering_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4849e8-66d0-418a-b7a8-60df23a3975a/how_to_install_a_defiant_indoor_digital_timer.pdfIn PDF document text
    • https://196cdf53-7a38-4f80-8f5e-3ad65c24f50e.filesusr.com/ugd/e5a593_0d9f2fd88b8242829dcd173fced760ac.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_261c04da20374b62893527915a35aa5c.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 4984 bytes
SHA-256: efcdcf73b6558ed8b2818d25f5ae4a2aa52220707690e93efa706b27dce8ccf2
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 10784 bytes
SHA-256: 385e509065d6ffd7cf31ac11fd36b5edc354d333346046a0a23aaa6a06cb6b4e
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361