Malicious PDF — malware analysis report

Static analysis result for SHA-256 46400fc0ee42b39e…

MALICIOUS

PDF

85.4 KB Created: 2021-03-30 00:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac68fa9e2fce07dcb556621bcc484023 SHA-1: d36c59b0a952ff80b15f4f60727aeeecd8d897aa SHA-256: 46400fc0ee42b39e104e1b90bca816038936fab391b5fb828cfaa4f8e3a262b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to a network of linked documents.

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://botokaw.ru/award?keyword=mylar+capacitor+codes+pdf
    • https://gemonozuwusub.weebly.com/uploads/1/3/4/1/134131657/porepuwo.pdf
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6030ecc2d540a.pdf
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/lepudexuwijuk.pdf
    • https://cdn-cms.f-static.net/uploads/4465557/normal_6019cfe0e44b2.pdf
    • https://cdn-cms.f-static.net/uploads/4403938/normal_6016f63084387.pdf
    • https://bejudovadavaz.weebly.com/uploads/1/3/4/8/134898120/7017457.pdf
    • https://povufajesozibu.weebly.com/uploads/1/3/0/7/130739002/8259856.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_8380a9ee6f4549408a4413087561065a.pdf?index=true
    • https://s3.amazonaws.com/sonutopexaramuf/84767090641.pdf
    • https://s3.amazonaws.com/bulozor/45395075351.pdf
    • https://s3.amazonaws.com/budovewesekaz/vevikuvedafijofexivameto.pdf
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_3e7bbd745c244990b22f08a4a94425ec.pdf?index=true
    • https://s3.amazonaws.com/setaxilitozuko/how_to_install_hp_deskjet_2544.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/feteduzabawalel.pdf
    • https://s3.amazonaws.com/tinivukedeta/57901442785.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_off00011070.bin
bb3afa342fead6e9c546a4b164d54a13bf19beb70d9ee6f357eb730e4d0f9efd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 5256 bytes
font_01_sfnt_off00012275.bin
4d41e7791cbd2aaeeaf62a31237683fddc1dfda383c9c187e191b61608045ddb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 11412 bytes