Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d4902fc1079187…

MALICIOUS

PDF

90.2 KB Created: 2021-02-15 07:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0c95214f018db7de336df7aabe5d4d09 SHA-1: f0db2e4f7c8ea0c494a1931066e189aede11953d SHA-256: c6d4902fc1079187ee5eb8397d8755d7b10c9ddcd913fb383cca77e4ecf54d6e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm designed to distribute traffic to malicious sites. One critical heuristic identified a link to a known malicious redirector, and ClamAV detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains text related to 'List of chief information officer of india', suggesting a lure for phishing or scamming purposes. No scripts were extracted, but the presence of numerous malicious links strongly suggests the document's intent is to redirect users to harmful 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
  • 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://crophysi.ru/wb?keyword=list%20of%20chief%20information%20officer%20of%20india In PDF document text
    • http://zikemipirelojo.22web.org/31198381957.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/markus_lupfer_size_guide.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/7059550.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/CibgcPZ/zoxugumufizi.pdfIn PDF document text
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/wawezen_farabawebuz_bezule.pdfIn PDF document text
    • http://fasodotujane.iblogger.org/5557385448.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/47e9e447.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/jumozebabusawujubof.pdfIn PDF document text
    • http://forexgeeks.net/ted_bundy_movie1qg33.pdfIn PDF document text
    • https://bigudiwox.weebly.com/uploads/1/3/5/3/135304820/lifijulanozefuj_suxomubilat_netotosare.pdfIn PDF document text
    • http://wuzubofetaxoger.iblogger.org/bovekesegipokuxog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisuvedo.rf.gd/sixuxuxe.pdfIn PDF document text
    • http://kitalanexu.epizy.com/99571157022.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/bexumevimosag.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_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 5172 bytes
SHA-256: 33af4b9a8a403159ec2190187953e2cbe4bd9c08c195748dff21fc08af3694e7
font_01_sfnt_off000136f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F4 10732 bytes
SHA-256: 6b79655ce18fc840de3a95c57f043613bc5bc076a811034620ccb493aafd15b8

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