Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcb488376cfbcc3…

MALICIOUS

PDF

74.3 KB Created: 2021-03-14 21:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fc6b839ff766db9f10e5f4768145cba2 SHA-1: 59430a51923a942d13bb26e7ebd648300bf7d4e8 SHA-256: ebcb488376cfbcc3812c24fa9227697426ccfa459f7669f5b38ef63ff1472a73
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a primary focus on directing users to 'golowaki.ru'. This URL is presented in a context that mimics a search result for a PDF, suggesting a phishing or malware distribution lure. The presence of numerous other URLs, some on disposable domains, further supports the link farm heuristic and indicates a broad attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=the+police+in+america+8th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fd5f60a955c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fe7a0255b88d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_601120e63fb61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601e8847a4029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403940/normal_5ff7a5dfb85b0.pdfIn PDF document text
    • http://noxitafevinuv.22web.org/sodastream_spirit_one_touch_troubleshooting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozejozonamolub.rf.gd/patching_sheetrock_hole_in_ceiling.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_af92527502354da79b296c60206dd292.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/vizexumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a41527-cbe3-4e45-8dea-2ba95bbd54a3/71617239979.pdfIn PDF document text
    • http://digifasofow.rf.gd/25967343197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1a97db-3692-41e5-8627-be4287890fab/tofilex.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_ef193a2670854217804ba9153a75055e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resisuna/spotify_apk_premium_ios_2019.pdfIn PDF document text
    • http://supapimegem.rf.gd/icloud_for_pc_windows_xp.pdfIn PDF document text
    • http://tolitaxolumupu.rf.gd/nafisuni.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_a8e86256ca04496497b374ba9d72b797.pdf?index=trueIn PDF document text
    • http://zatafefot.rf.gd/adobe_animate_cc_2017_32_bit.pdfIn PDF document text
    • http://pomirunorejuso.epizy.com/zavutexanat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fbee1f-2f2f-444d-9e4b-7499e83c94a8/the_kiss_quotient_movie.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_a74cc810fd6847c8803d19f37b46473f.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_6b5b823f64cf4722ad97761e471999ca.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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 5360 bytes
SHA-256: 2f04cef84ecb22302ff7d5c01dfdbfc06da103b0d9594a6a1729dc5ada60636b
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10808 bytes
SHA-256: eb6dd1cd62b8280f03ceb717d3daa180a6379f09f72a6ac0033120218f6f5196

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