Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee987c33024538e…

MALICIOUS

PDF

88.6 KB Created: 2021-03-11 09:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3a83182c7a3ed0a63ea0e5e90256cc83 SHA-1: 22d088aab14c03540093392070db429f34db6079 SHA-256: 9ee987c33024538eb43202e9e2adfac5ecf363fee376ac4ae760c9e009769e13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a link farm with numerous external URLs, including one pointing to 'seumenha.ru', suggesting an attempt to redirect users to malicious content. The PDF structure and embedded content are consistent with SEO-based link farms designed to distribute malware or facilitate phishing attacks.

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://seumenha.ru/award?keyword=chronic+rheumatic+valvular+heart+disease+pdf PDF link annotation
    • https://cdn.sqhk.co/winogolelog/ii74wGT/guxenaneku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_6009dace7432b.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/3pnQZHD/9177870418.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/bVigYja/hexagon_ppm_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_60442110047e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384323/normal_5fe2b345c6df8.pdfIn PDF document text
    • http://tortomsk.ru/54359967938fshqa.pdfIn PDF document text
    • http://toportt.online/sozupitemirarepk9mf3.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/jEOhfjg/vabelol.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/d2ef6066-dbb0-4cd5-8cc4-2967ec5d7050/duferu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4f8ce9-8586-43d4-ae1b-6f36aa7f4ccb/19203099719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/664616dd-336a-42c7-9219-36e186f6ff9c/genegavejasabepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e478fdb2-ad20-42e6-8060-fa3e0e1fe176/lelow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d67b71-d68c-4123-bf81-bc26c6167b16/minecraft_pe_survival_island_seeds_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb03724-b8ae-4e25-8b41-ef580f1e5c4c/dance_80s_music_disco_mix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f01438-afc1-4b77-9c8f-83b01ee29d14/pumesu.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_d1b60b8b40764a1a9200261c7141b6ee.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_5be36fd9d9854ce49bcbee2a96a13458.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 5360 bytes
SHA-256: 0602584ad7e5fc3ef26f3fd132801dcb3ea67265ee6a4b30302b32831eef3c0a
font_01_sfnt_off0001303e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303E 10780 bytes
SHA-256: da2cf4e82de9a85c7cd6d52663b90bb43fedc63fae3bb03d15c593647e91ae3f

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