Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e42311902d258aa…

MALICIOUS

PDF

72.8 KB Created: 2021-01-14 22:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 295035e23a600d74825b538bc57df5cf SHA-1: 725ffadbcd612f718af51d182f3874748273f44e SHA-256: 0e42311902d258aaeabf032f2d485832fadae1fdd06c11bc211259dd5db440da
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine rankings or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a phishing trojan. The embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=blue+hole+lake+camden+county+nj In PDF document text
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/3318456.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/6258abe775d2.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/5750051.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/lusilataviludova.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/629783.pdfIn PDF document text
    • https://site-1174278.mozfiles.com/files/1174278/hangar_bay_definition.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/e0d3f5e45b28abd.pdfIn PDF document text
    • https://resudejo.weebly.com/uploads/1/3/4/4/134471902/jijaximudis.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/fefasupomikudorax.pdfIn PDF document text
    • https://site-1209079.mozfiles.com/files/1209079/10027490795.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/4bb77ca20f.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/loranoduzuja/dictionary_and_thesaurus_worksheets_free.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_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 5196 bytes
SHA-256: e0ccd4d2908cfeefea961cfb52610202b97b854ddd9cdf445ee5ba7c805472c7
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 10456 bytes
SHA-256: 437b41612510f4ae4700d962980c77315541aa7c7a5c523945391ebe9f7f4334

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