Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c8ca54b731586f…

MALICIOUS

PDF

79.7 KB Created: 2021-04-12 08:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 136ba6f1cf8da6fa07bc732131b0dca7 SHA-1: 55e6263d051aa946b8e1c92c0d21484ee11112c3 SHA-256: b3c8ca54b731586f9c9ad463b49d24e385cc4664feaf22f4aaef75023e9b009c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF documents, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs likely lead to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/strik?utm_term=visual+basic+2015+pdf
    • https://cdn-cms.f-static.net/uploads/4427076/normal_605f6af93bcff.pdf
    • https://static.s123-cdn-static.com/uploads/4471704/normal_5feec677bc405.pdf
    • https://momaduse.weebly.com/uploads/1/3/4/8/134895420/tifuketavepipidevade.pdf
    • https://cdn-cms.f-static.net/uploads/4495536/normal_602b4654f35a5.pdf
    • https://cdn-cms.f-static.net/uploads/4366036/normal_6024b5db7586b.pdf
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/6b2a520e68.pdf
    • http://zugapuvu.mywebcommunity.org/7347976440.pdf
    • http://pitushok.space/staff_of_serapis_read_online1r5v1.pdf
    • https://teraxamexad.weebly.com/uploads/1/3/1/3/131380600/6325559.pdf
    • http://gratoram.site/garden_eel_care_guidedunt7.pdf
    • http://shoop-fo.ru/xapirezuwufepovaled713fu.pdf
    • https://cdn-cms.f-static.net/uploads/4417997/normal_600d9df8e2871.pdf
    • http://zutatowatipo.mywebcommunity.org/cambridge_primary_science_learner_s_book_grade_4.pdf
    • http://vashastrahovka24.ru/bobomivijg3vl.pdf
    • http://auth02mobility.com/principles_of_microeconomics_mankiw6yzwh.pdf
    • https://cdn-cms.f-static.net/uploads/4450345/normal_603c03c5bf41b.pdf
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5ff323dd4e289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_23b3be8427a64c31a9815c7802923498.pdf?index=true
    • http://sasukagisodubex.onlinewebshop.net/what_are_the_different_text_structures_in_reading_and_writing.pdf
    • http://mobukug.myartsonline.com/corsair_cx750m_cable_kit.pdf
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_08c49df0bab04d78b8a0977241c4e781.pdf?index=true
    • http://jonesojawu.myartsonline.com/93629819903.pdf
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_660a974edce741f3b7773a63418da811.pdf?index=true
    • 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_off0000fbf8.bin
6c5470cba337e297fb834bd148a782de6b2e8bfb2e3257c552f36d56bb1f9d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 5608 bytes
font_01_sfnt_off00010f30.bin
94fc515fe2497ecd1e5b76613a33eed91c00e2d1c05fe97db972b81160b2e7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 10112 bytes

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