Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef0e71c01f98ce2…

MALICIOUS

PDF

80.5 KB Created: 2021-04-18 09:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db1c48eb7c4f496b1e7fe3c41d7e62e2 SHA-1: e8dd8bc2e86d25ae761a13089d75953e3044ff6d SHA-256: 5ef0e71c01f98ce2c122687060418fbfede921000257f09674dffc6a13113461
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a campaign designed to redirect users to potentially malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+tell+if+the+fitbit+flex+2+is+charging
    • https://xepebujusu.weebly.com/uploads/1/3/4/3/134319702/eef53.pdf
    • http://uniques.space/niwuronusotapivirxkmmw.pdf
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/3806821.pdf
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/8b03230c31.pdf
    • http://titoto.xyz/73220188900a7mbf.pdf
    • https://karewugudamebag.weebly.com/uploads/1/3/3/9/133986918/7016326.pdf
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/kiwusemivemi.pdf
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/520897.pdf
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5fd92db502442.pdf
    • https://cdn-cms.f-static.net/uploads/4466140/normal_60581840d224b.pdf
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5ffdc5aad9173.pdf
    • http://onatural.space/84245598854tyku8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c066883-dcfe-40cd-8545-ec474957b0ba/sovapufan.pdf
    • https://uploads.strikinglycdn.com/files/d3e9ead9-014a-4dc4-8f30-54531cc63586/vusokowasasupexirok.pdf
    • https://uploads.strikinglycdn.com/files/fc76411d-4a32-45eb-94a2-33bb81f5acc7/dobaxegerej.pdf
    • https://uploads.strikinglycdn.com/files/6cd21ca1-3423-4f51-810c-688987d489ad/what_is_the_schedule_for_the_playoffs.pdf
    • https://uploads.strikinglycdn.com/files/5515ce49-7f8a-4b86-a2c7-e85d6a2acba8/how_big_is_a_large_side_at_boston_market.pdf
    • https://uploads.strikinglycdn.com/files/684eae4f-e357-41dc-ba9d-85c562d4a3ce/edenpure_scalerid_reviews.pdf
    • https://uploads.strikinglycdn.com/files/dc0f9cbf-0e44-4029-8ff3-a7f99ddc0032/generac_onewash_no._6602.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_off0000fb4d.bin
0299aa97679371ab4a97c4428c25841d7e8f6e4a2403f6f97d95f54b5f758945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 5536 bytes
font_01_sfnt_off00010e36.bin
27da28c563546c4ed44804de40016ae8323836494c0abf9594ff2ac96f955e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 10680 bytes

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