Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3eb38c570354e0…

MALICIOUS

PDF

67.5 KB Created: 2020-12-26 00:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0e85c29437ae4980c42aab5fcd182079 SHA-1: 19b6c1f3e90ad2a253be55e375242360d8932680 SHA-256: 8b3eb38c570354e0ab86a226bc16ede7542dc3b5c317dde771dd4bd84d3f9dfa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. One prominent URL, 'https://traffnew.ru/strik?utm_term=equalizer+pro%2528+music+player+v2.+6.+1+apk', is presented as a download for a music player, likely a lure. The ClamAV detection and ML classifier further indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffnew.ru/strik?utm_term=equalizer+pro%2528+music+player+v2.+6.+1+apk PDF link annotation
    • https://xapotaligefako.weebly.com/uploads/1/3/4/6/134612972/zudigiwonu-tetonusupugu.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/augcVy7/accubow_2020_app.pdfIn PDF document text
    • https://degepuwenezeg.weebly.com/uploads/1/3/1/6/131607310/07a5287.pdfIn PDF document text
    • https://cdn.sqhk.co/xinovupu/PggCuhc/61890389697.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/ieigidp/pigizusabadugawaduzudiza.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/eqhehFE/hippity_hoppity_this_is_now_my_property.pdfIn PDF document text
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/d6d72e733.pdfIn PDF document text
    • https://bunevozobete.weebly.com/uploads/1/3/4/7/134714888/gugigatugisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d23727-f63c-4f25-9928-9ff95f0d96b2/fasitejiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64642135-8f91-4a4a-9ff3-837a9fc03639/vocab_workshop_level_e_unit_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/67222456966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b190083-c149-4999-829c-89f8b2dc68fd/zelefaruv.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/chapter_11_growth_and_expansion_answer_key.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 5884 bytes
SHA-256: d1e6e1a4067bd80eb973e703288f0c55c80ad4fa9b7fa40aed1b02f2d9faabfc
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10704 bytes
SHA-256: c4bb2d1ad08d62d7f3d8829e04b8b264e352fc57352d8ff98f285ab0b7e8b440

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