Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c001c126c93db5…

MALICIOUS

PDF

73.0 KB Created: 2021-06-10 09:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ca71dacae6f28fa9c178f9f9a42b287 SHA-1: 04dd0894b5145d5415607c44c8dc2e785a4a0760 SHA-256: c2c001c126c93db588809b89f5b90b56e25262c436895f019955fcc7c7a2fd83
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary external links, 'https://pixomot.ru/pbw?utm_term=california+death+certificate+worksheet', indicates a lure to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://pixomot.ru/pbw?utm_term=california+death+certificate+worksheet
    • https://cdn-cms.f-static.net/uploads/4471692/normal_602c671987ad5.pdf
    • https://fedufifor.weebly.com/uploads/1/3/4/8/134894833/3453343.pdf
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5ff315bdca7f4.pdf
    • https://cdn-cms.f-static.net/uploads/4502721/normal_6051dd8da43d9.pdf
    • https://cdn-cms.f-static.net/uploads/4477155/normal_605ac467e7ec7.pdf
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5ffc02e9eef00.pdf
    • https://static.s123-cdn-static.com/uploads/4374698/normal_5fdd8c414db9f.pdf
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5ffc18fec5528.pdf
    • https://cdn-cms.f-static.net/uploads/4365540/normal_60bb95b51e700.pdf
    • https://sozaruterir.weebly.com/uploads/1/3/0/7/130738534/6575735.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_602ec0d34ff57.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xosezoranad.pbworks.com/w/file/fetch/144968196/aladdin_full_movie_2019_online_free.pdf
    • https://uploads.strikinglycdn.com/files/aab29118-9958-4653-939f-be3e59a40e23/vibosumosesadok.pdf
    • https://uploads.strikinglycdn.com/files/a037fe0d-5506-4578-acd9-a1854cbe7e49/baperupokumikiselesu.pdf
    • http://zuwofig.pbworks.com/w/file/fetch/144644766/ocr_a_level_biology_paper_2_june_2019.pdf
    • https://uploads.strikinglycdn.com/files/56cbadca-b1f0-4516-9836-e41cd9996dcc/vovedisevapasu.pdf
    • http://jotoxipigi.pbworks.com/w/file/fetch/144453477/vogafudejemojafi.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_off0000df47.bin
adafbb204d8871007a304feefae2a81a7e4bc93d17eceac651be3e270b3fb881		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 5168 bytes
font_01_sfnt_off0000f0e8.bin
0078dad28c94fb7273d80dd693176e0d65cab6bd68ad60b86fb1e1059a76b5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 11348 bytes

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