Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34e074df5600b40…

MALICIOUS

PDF

78.9 KB Created: 2021-01-11 05:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1d2f26d3207691996e1ce2eaffe6ee4f SHA-1: d20a4259112e77838c3a8bb4d82897082b8b8f56 SHA-256: a34e074df5600b402c2d08535674480823993f70570408168c90d372342bf80c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with one prominent URL being 'https://trafftec.ru/123?utm_term=mafia+city+hack'. The document's purpose appears to be directing users to a collection of other PDFs hosted on disposable domains, suggesting a tactic for SEO manipulation or broader malware distribution.

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
  • 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.
  • 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://trafftec.ru/123?utm_term=mafia+city+hack PDF link annotation
    • https://site-1201147.mozfiles.com/files/1201147/brick_breaker_revolution_full_apk.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/8282755.pdfIn PDF document text
    • https://dugepawegozil.weebly.com/uploads/1/3/1/6/131606694/818ad561.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/6327260.pdfIn PDF document text
    • https://site-1175393.mozfiles.com/files/1175393/68891715738.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/4928163.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/c2b64.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/1372948.pdfIn PDF document text
    • https://memupenenukef.weebly.com/uploads/1/3/4/5/134527104/644a0.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/7986930.pdfIn PDF document text
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/nefegeforu-piwidinivegiri-jelumamemekodu-rilowigikolilo.pdfIn PDF document text
    • https://vukuwapebu.weebly.com/uploads/1/3/5/3/135310377/jenise_wojonuxixedixiw_ritixajezep_fuxozerulajowoj.pdfIn PDF document text
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/f6e091a699e56b.pdfIn PDF document text
    • https://febosefukeja.weebly.com/uploads/1/3/5/3/135324858/4b5d80f6d35608e.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/xedewofuretujo/nsfas_online_agreement_form_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 3020 bytes
SHA-256: 9ae62a2c44dc348bcb7e87aa6ffc1f7b2a291e99a8b8e61f0b6f9fbe63e7ef7f
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 4836 bytes
SHA-256: 7d88b2d5775c31dc8e6152bba36dac0d646e716c7105d0175ae5b4b63dd13d00
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 11104 bytes
SHA-256: b152eddd4c0c1e335885c7e944b838acf6f77cf50ee8a0cc8d8f8588ceba224e

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