Malicious PDF — malware analysis report

Static analysis result for SHA-256 b655a3fe268a1c1c…

MALICIOUS

PDF

75.9 KB Created: 2020-11-26 10:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c6a9215f1dbceec7594a0100bbc074e4 SHA-1: e4a5b73405c486c37b184add93a22034878cb307 SHA-256: b655a3fe268a1c1ce20e6c151851abd08fbf3ab3c528ee5f1a55af3b648ea08c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm and a critical ClamAV detection for a phishing trojan. The presence of numerous external links, including one pointing to 'traffking.ru', suggests a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffking.ru/123?utm_term=crosman+pellet+pistol+sights PDF link annotation
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/4625c341ebff1.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/3257372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_5f94c86bc84f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f8ee1920184e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fa556e89685a.pdfIn PDF document text
    • https://dunabosugetagek.weebly.com/uploads/1/3/4/6/134601841/zukofovuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5faa12e0ec550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wemazun/38485676254.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/kovelupufozexitunemomop.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/chemistry_a_molecular_approach_3rd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/balancing_redox_ionic_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/falugidosunevexofivoju.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/algebra_2_big_ideas_math_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/zufemuvabigoneganadonok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 5044 bytes
SHA-256: dd88d4d19367e9b43b2b53f86196f88f58663ca8e090d916a1db5ba45b680531
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10036 bytes
SHA-256: a19d30ee41ab4a5f2734f2b86832641fc9353d0066e004e9f8e22d85444d27e9
font_02_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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