Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a89b76222966753…

MALICIOUS

PDF

70.9 KB Created: 2020-11-11 22:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f17b05aa91596b1afa486d57ec54620 SHA-1: 1914b34363c2732209e1be39f84018fa17ba1b34 SHA-256: 8a89b76222966753796f24e9826b3cf8baa15b3c7568616bbdf8e342e6cc1e2d
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farms, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=political+science+textbook+pdf
    • https://cdn-cms.f-static.net/uploads/4416806/normal_5f98751319544.pdf
    • https://cdn-cms.f-static.net/uploads/4380705/normal_5f9327876abd6.pdf
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f9c5ce56dc5f.pdf
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/1465253.pdf
    • https://badipixurer.weebly.com/uploads/1/3/4/4/134456466/a68a45.pdf
    • https://wulonuvesiga.weebly.com/uploads/1/3/4/3/134362584/femir_danufatasoka_dadunama.pdf
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/duduwoxisumijetatot.pdf
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f8b4a219dbbf.pdf
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/6e5d4e73e2bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/70c3eac2-0ae8-4421-b4c7-3dc12701e361/equilibrio_acido_base_en_el_organism.pdf
    • https://uploads.strikinglycdn.com/files/06de4721-a8c2-4c65-babe-0d117308ded8/globalrph_dilution_methylprednisolone.pdf
    • https://s3.amazonaws.com/tevigotu/secretariat_movie_end.pdf
    • https://uploads.strikinglycdn.com/files/0da5acc4-b91e-4f68-a65c-78cfb900b98b/xukipezoxejuniko.pdf
    • https://uploads.strikinglycdn.com/files/fcb5244c-ed3d-44fa-ac89-8a47bda74202/zipibanopepunekitamunanop.pdf
    • https://uploads.strikinglycdn.com/files/9eec7b67-558e-4e9a-a638-726a9ff2bf52/kajufopiluzuzi.pdf
    • https://s3.amazonaws.com/ropuba/ib_learner_profile_poster.pdf
    • https://uploads.strikinglycdn.com/files/0d89eff8-c2a4-45d2-bf31-ba921ca81ea9/90367538197.pdf
    • https://uploads.strikinglycdn.com/files/f2ebe878-5f39-4bad-bba0-dd0346a8fc05/9354991432.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_off0000d93c.bin
f6cf5d4358fcf4e60f9f3156dc153f9d7c479f9eeefa0bfc8bfa8285e68fb2c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 5328 bytes
font_01_sfnt_off0000eb72.bin
b4b04498fcd4310c3f2d591c7c9527307ba8d748de8a8b15f68a094619538549		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 10300 bytes

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