Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec656f758192af4…

MALICIOUS

PDF

65.9 KB Created: 2020-11-18 05:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2229b6fca1cfc26fabfd87f0ae84b097 SHA-1: b67b0f27642c300ad885762fdecb6457c43c6f8e SHA-256: cec656f758192af4f95d25ba85bc745be4966c0f4b09f4a561ad99de8c12531d
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded links pointing to external websites, with at least one URL (`https://traffset.ru/123?utm_term=collins+hill+high+school`) being a potential indicator of compromise. The document's structure suggests it functions as a link farm, likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffset.ru/123?utm_term=collins+hill+high+school PDF link annotation
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bekalan.pdfIn PDF document text
    • https://gosasomaf.weebly.com/uploads/1/3/4/3/134370397/3267473.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/jidek_kinadutema_lisoj.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/8502596.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/gutabugilikudinusi.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/vadewulusiter_jupezitejok_tuzadaru.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/7ad8692d31068e.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/724488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_5fa36b9c32cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5f893de415a4e.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/jufowokedunod/html_css_templates_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b6cadb-8386-4b24-934f-45bcc74f0aa9/criminology_books_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/94597327521.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_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 4660 bytes
SHA-256: d111e0e71217ef9e0216123f142809c8cb7c08a812f505ee1fe24f8c079c6d49
font_01_sfnt_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 11496 bytes
SHA-256: 9f67b6a766ba4234c59d00a8c01b01a81623399fe43b74727ebc70e1679c4958

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