Malicious PDF — malware analysis report

Static analysis result for SHA-256 960326f619b9f860…

MALICIOUS

PDF

75.1 KB Created: 2021-02-28 21:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b05b542702de4772b6981d76b38629fc SHA-1: 2cad478bcb0f724340616b7a28f2f05205d8b6bb SHA-256: 960326f619b9f8607c6413710de08ceed8cc5f6048901cc85175bf1a835c9263
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://jottigo.ru/strik?utm_term=summary+of+the+story+the+myth+of+sisyphus, appears to be a redirector. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

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://jottigo.ru/strik?utm_term=summary+of+the+story+the+myth+of+sisyphus PDF link annotation
    • http://romotogez.22web.org/pekotipiwara.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/ijgiehc/52509201036.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/rIz0hiH/difezuv.pdfIn PDF document text
    • https://cdn.sqhk.co/pedajobu/riikvji/galavixulom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_6035c5520727c.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/xusineg.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/98473433862.pdfIn PDF document text
    • https://vudiwajexisipu.weebly.com/uploads/1/3/4/0/134096418/a73b2446.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/hiMicuQ/60962944171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_603855cc7bd69.pdfIn PDF document text
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/b143969d8c6e60f.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/10573339127.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/iawxijl/18481902733.pdfIn PDF document text
    • https://cdn.sqhk.co/buzunonoj/ngeYigT/rukafetonafugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofegatedil.rf.gd/sumivamax.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/cub_cadet_lt1050_transmission_belt_replacement.pdfIn PDF document text
    • http://disidigepaxu.rf.gd/narrative_of_the_life_of_frederick_douglass_an_american_slave_summary.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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 5316 bytes
SHA-256: 2c82cea5329ab0a7c6e41913e5a0a64a30ed72947a853a9391b775627c3fd999
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 10412 bytes
SHA-256: 14bccf7d25d561041c82d75ae937c6cb9572fbcf531b84fe1f77bf71317c69a2

Open this report in the interactive analyzer, or submit your own file for analysis.