Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec827d218008cd48…

MALICIOUS

PDF

85.8 KB Created: 2021-05-22 05:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ac41198a09f66fa2d979e41d359663f SHA-1: 4e22ed11b3880889cddf67d5b4fb1577338f1bb1 SHA-256: ec827d218008cd48425d0734b112f03a7c4d346f7efaf6b6aae35e7ec2947b52
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a site related to workout plans. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=gain+muscle+workout+plan+pdf
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fd038e08a74c.pdf
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5ffc52a80e08e.pdf
    • https://static.s123-cdn-static.com/uploads/4402740/normal_6006287ee8b25.pdf
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5fe5e1d0d5eca.pdf
    • https://cdn-cms.f-static.net/uploads/4448339/normal_5fd7d8c550f6a.pdf
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6051ef7c63c7c.pdf
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/purus-gurot-revefinevewe.pdf
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff764f1e4c92.pdf
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/letegepozifidud.pdf
    • https://cdn-cms.f-static.net/uploads/4369912/normal_60267b18d9f4f.pdf
    • https://cdn-cms.f-static.net/uploads/4411498/normal_606e5f1d6fecb.pdf
    • https://static.s123-cdn-static.com/uploads/4425504/normal_5feea9df2f0bf.pdf
    • https://cdn-cms.f-static.net/uploads/4416302/normal_5fd0fe0d9e21c.pdf
    • https://cdn-cms.f-static.net/uploads/4409992/normal_602ae838e8030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kukazowox/dagokezuwatexiniwe.pdf
    • https://uploads.strikinglycdn.com/files/c42f65e7-f6a0-489f-b564-ebd0fdaf4d7a/43734581914.pdf
    • https://s3.amazonaws.com/xidulumexi/jujugoparerubesosir.pdf
    • https://s3.amazonaws.com/dadupawo/kofinawukisojuwivo.pdf
    • https://s3.amazonaws.com/pisedij/old_skype_for_mac_10._6._8.pdf
    • https://s3.amazonaws.com/tanikanaw/nj_fishing_report_sandy_hook.pdf
    • https://uploads.strikinglycdn.com/files/e8a747f1-fb9f-40ee-bac2-657a33d851ae/bodyweight_exercises_for_biceps_no_equipment.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_off00011305.bin
23546d7b4b0d5ff0bc0e41055462ae3fda0de03c6980a84d7500ff927b5b9207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 5488 bytes
font_01_sfnt_off000125b4.bin
2de97febd47500beb4f4d16eccf6c591a600aa00a07bfc15b9259783e64fcfd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 10264 bytes

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