Malicious PDF — malware analysis report

Static analysis result for SHA-256 5856ab8d7c5485ea…

MALICIOUS

PDF

67.1 KB Created: 2020-12-02 23:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2f7d8b82ceaeceab21916e59cc278890 SHA-1: 7e8f04edd7c8aaacb72da0019a7f7ad3a27accaa SHA-256: 5856ab8d7c5485ea551691b037b2f4e4df16e29e2b36eb0f7743d6e669c6dd57
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable hosting services, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a job application. The primary function appears to be directing users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/strik?utm_term=tropical+smoothie+job+application In PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/tejebabeni-nesevofowafejo-gulufasobeger.pdfIn PDF document text
    • https://dapamokosow.weebly.com/uploads/1/3/4/3/134337633/fofarewokefozoxero.pdfIn PDF document text
    • https://torawatuxopo.weebly.com/uploads/1/3/4/3/134379163/fenewekiloginu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fc1d8fd38413.pdfIn PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/bubapa_vagovuzit.pdfIn PDF document text
    • https://niwubeleligijoz.weebly.com/uploads/1/3/4/7/134764474/senaruxilu.pdfIn PDF document text
    • https://vowitaxarutivo.weebly.com/uploads/1/3/4/8/134870451/1daa85a562f21c.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/7f0772fc54236a.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/nemitaxebolevutu.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/tawosutosuxi/verizon_motorola_droid_turbo_2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/bowie_knife_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/21806760008.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_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 5340 bytes
SHA-256: d89f073fd3925dddfe181d4cf8cb9009d88122d6061c3656a3f23d486aae10da
font_01_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 10564 bytes
SHA-256: 70219722cf5a0c9d50c77cb073fed63b4721ac27f50efd757d6eef7c2bd6a5e7

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