Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8d98b9dd00f14f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-07 11:37:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2965b6c1e6e7e107a10a388b128b5201 SHA-1: e4ddcce026f260bb485ca78fc8afede2fd7f0c82 SHA-256: 8b8d98b9dd00f14fd8bf489d1dafac5d1a9857fda490691b5ae14d5b83bcdad5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=skyrim+alternate+start+not+working PDF link annotation
    • https://lorerepurukese.weebly.com/uploads/1/3/1/4/131453396/sisonexejopatavon.pdfIn PDF document text
    • https://lafivejazep.weebly.com/uploads/1/3/4/7/134771341/sesawawomex_fizifigefitu_zinetexetusode_dimaxumizox.pdfIn PDF document text
    • https://tasimaxexakopox.weebly.com/uploads/1/3/2/6/132681882/50c0819c0a91.pdfIn PDF document text
    • https://govodiroruje.weebly.com/uploads/1/3/0/7/130775462/zisuzu.pdfIn PDF document text
    • https://dojebuxepoviguf.weebly.com/uploads/1/3/1/4/131407435/pomefumis-xuzixube-takeburug-vunufamab.pdfIn PDF document text
    • https://jerusofiv.weebly.com/uploads/1/3/0/9/130969981/duxuxam-rajig-gevovufikebog.pdfIn PDF document text
    • http://paselon.getenjoyment.net/puwabufugilopuzederarawiv.pdfIn PDF document text
    • http://didazema.mypressonline.com/67318759766.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/sears_catalogue_houses.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/7927357.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/vitixazurajume_duvutuxapew_totajulon_zezepuberi.pdfIn PDF document text
    • https://pafetujesotizi.weebly.com/uploads/1/3/5/3/135348857/948966d.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/dezewegetew.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/80d066d3-8709-49ab-86ee-e8f0b3d8f6cb/kozagekobovizetofezizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab1647f-58d7-4364-a10d-c85c9dbdff4e/que_es_una_composicion_escrita.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/68334262964.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/citizen_navihawk_at_instructions.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/nizopetakoxadujazo.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_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 5364 bytes
SHA-256: 278f7db2b36afbcce67c1f6c9d7742fd7f0e37536afa442c0a8c0509e82b91ae
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 10184 bytes
SHA-256: 4b37875c37e9d3cd1d9f9f9b5de7c9c2276cdbdd50c2539a9b0c18165cd7c4cf

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