Malicious PDF — malware analysis report

Static analysis result for SHA-256 77871885b906d1e5…

MALICIOUS

PDF

67.8 KB Created: 2020-12-17 04:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e57037774866a3d5ca8355cb91d2bc4b SHA-1: 250fa6a9a6f46506d0bd60317b458ddc4b01e9c7 SHA-256: 77871885b906d1e5a06f623e2f7a0d38698e65d965b28c9552cb90c48a2ec948
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, but one prominent link points to a suspicious domain ('trafficel.ru'). The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is part of a link farm or phishing campaign designed to drive traffic to malicious sites.

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://trafficel.ru/123?utm_term=this+war+of+mine+tips+board+game PDF link annotation
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/5742979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_5f8f2f7d7b1a9.pdfIn PDF document text
    • https://guliwomijura.weebly.com/uploads/1/3/4/8/134846957/kosulux.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/2629175.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/gidifuliripedopuno.pdfIn PDF document text
    • https://nedudefo.weebly.com/uploads/1/3/4/3/134389218/sipoj_zukamupulu_nexen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotizifime/tipos_de_canales_de_comunicacion.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/drive_in_theatre_athens_tn.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/manamaligixoni.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/nekip.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/21719971945.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a7518651a04751993a6e/t/5fc9d5d5887b444c6157c71b/1607062998588/pixel_car_racer_hack_ios_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5778f405d5340f3487ee4/t/5fd6eafc313c42342ba16cd2/1607920381232/tiremaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/75919541296.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_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 5604 bytes
SHA-256: 639c3352ff00bbba0d14961aaa939cc2ffad6e3a8922edf2c4d68f8753f10632
font_01_sfnt_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 10228 bytes
SHA-256: 30e66dc32f1042280eb4a46a882d5ea4b555440c9b59d923f6f443616124051f

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