Malicious PDF — malware analysis report

Static analysis result for SHA-256 826809419b5c55cf…

MALICIOUS

PDF

70.6 KB Created: 2021-01-17 04:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 159210fe779aea2a48208b65b61450e2 SHA-1: ed6b831c6a36604271cb8bba007985c08d43dbe4 SHA-256: 826809419b5c55cfb7f8e08489704d3523d3aa3bef201fc99f65cb30e35e3693
264 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a critical PDF_MALICIOUS_REDIRECTOR_LINK firing. It functions as a link farm, embedding numerous URLs that point to other PDF files hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of a SE_CALLBACK_LURE heuristic indicates a potential for callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/123?utm_term=ender%2527s+game+characters In PDF document text
    • https://cdn.sqhk.co/daxonotetil/mhiWifT/owo_bot_discord_commands_osu.pdfIn PDF document text
    • https://loloxemevo.weebly.com/uploads/1/3/0/7/130739498/wilugimurewudidusa.pdfIn PDF document text
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/1a482d6ecb1b.pdfIn PDF document text
    • https://witatike.weebly.com/uploads/1/3/2/3/132302928/de582e69899230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_5faf2feb9af97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474471/normal_5fe2431597821.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/zadijilizag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5fff744ea5676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_5fb6dfd6073c8.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/9842526.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5feea077e315f.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/jivala/57162719943.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/dibunezevor.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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 5312 bytes
SHA-256: 38e0978109da530728092a2015bcf33b32ca9f61e90c6bd9ef9978870dbbbb46
font_01_sfnt_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 11288 bytes
SHA-256: cf209d11638a26d653c9c3568aace98ac1aa75abea888643de3dc4671d00f050

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