Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e1ea7fe8fc7479…

MALICIOUS

PDF

80.4 KB Created: 2021-03-26 12:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67c96751ecd04d52e47c23ca2b4278c1 SHA-1: d852c0559a4dd04bc1bc70d0007706cfe43ac06e SHA-256: 38e1ea7fe8fc7479c4ee46bcefdfcf4250581d45a1627152700b0ff3edf08780
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The presence of a password-protected archive lure heuristic indicates an attempt to bypass security controls by encrypting a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://soxebez.ru/123?utm_term=myeloproliferative+neoplasms+treatment+guidelines
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/zolor-soweborawedugu-gurapu-bafanuwovo.pdf
    • https://cdn-cms.f-static.net/uploads/4421038/normal_60234f9854299.pdf
    • https://cdn.sqhk.co/fikalibumi/ihhUjak/25079868104.pdf
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/kofufunaw.pdf
    • https://cdn.sqhk.co/jabosuve/jh9iiaO/baseball_boy_hack_download.pdf
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/wisipetumika.pdf
    • https://cdn-cms.f-static.net/uploads/4480402/normal_5fd79d412bf29.pdf
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/jomud.pdf
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/dijuduralejuxan.pdf
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/tojovadamiza-reforasiz-gaxuwinuzovit-fataf.pdf
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/4618114.pdf
    • https://pemolodubi.weebly.com/uploads/1/3/6/0/136052155/bujuxiwuj_damirufuvumu_benetepara.pdf
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/puxirax.pdf
    • https://nobenala.weebly.com/uploads/1/3/4/3/134348336/6325099.pdf
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/lovenapase-nerupotolinir-sebivumasexud.pdf
    • https://cdn-cms.f-static.net/uploads/4474750/normal_6053045d765c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eea996cb-7b33-4afa-8996-aed27620054b/bissell_proheat_turbo_2x_manual.pdf
    • https://uploads.strikinglycdn.com/files/8ced5018-2c10-4a47-822b-f42ccd514751/cloudy_with_achance_of_meatballs_2_chester_v_betrayal.pdf
    • https://uploads.strikinglycdn.com/files/8341fc84-2fec-4f4d-becb-425aa6512da8/what_are_the_5_general_climate_regions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae0.bin
8ceb42b7a8bf6f3a61113f0818f4be8f4df800464fb7a0bbb31fbcf0a7a9a626		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 5528 bytes
font_01_sfnt_off00010db4.bin
baf4a4d1d4646e54ac9e9776d22e31a283de88f1d9ca26a69a98b2de3d3af6fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 11280 bytes

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