Malicious PDF — malware analysis report

Static analysis result for SHA-256 987f178088ae231f…

MALICIOUS

PDF

71.4 KB Created: 2021-04-07 00:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3a6d8431d00eca1e610d0aefde2732ed SHA-1: 43a64590e5bb65240b6d22c55777bf71d6f49143 SHA-256: 987f178088ae231f97a601c0cd26c4648771f2a15115480ee86488e275324658
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible. No scripts were extracted from this sample.

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://ponafet.ru/award?keyword=bergey+s+manual+of+bacterial+classification+pdf PDF link annotation
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/gapofojot.pdfIn PDF document text
    • https://jiliwadikejupa.weebly.com/uploads/1/3/1/3/131379685/babiligeve.pdfIn PDF document text
    • https://dizorewumuzesab.weebly.com/uploads/1/3/4/0/134012942/witutokoxeforibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_60649c1a7214a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376854/normal_5fef4f00a0a3a.pdfIn PDF document text
    • https://wevejabunom.weebly.com/uploads/1/3/1/4/131406075/zugituposugo_xubeb_pobipidikotidi.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/pefusipus.pdfIn PDF document text
    • http://deutschebank-meine.com/freightliner_m2_service_manualb1y3i.pdfIn PDF document text
    • http://dorightschool.com/free_recharge_my_idea_mobile_numberp3ebt.pdfIn PDF document text
    • http://bridgecommerce.com/sloppy_birdo03xx.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/9ea3c3946b.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/djbzgeC/36174505412.pdfIn PDF document text
    • http://sputnews.com/96780166368bgztx.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/92f4ce01cd82d6f.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/fjghj48/air_hockey_machines_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31aaa731-3273-4033-a2c0-c705e562834c/2._what_holds_atoms_together_in_a_molecule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b63eb3-95a2-4e17-b5d4-75d900bda115/24719073622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5851529-adf4-49c1-b4db-cda40ec3ec57/dumesatepuxarezufipe.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 5768 bytes
SHA-256: 8cb603c2dd5f4e2d248a75e79f5ec0baf8162d1aa9a374dc78d22d69976e916d
font_01_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 10896 bytes
SHA-256: 8e1fd389c155364033f328b3505c63682d0f3a6b764e72c4909d4fe99a89ec6b

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