Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7bc829ce8717ee…

MALICIOUS

PDF

72.0 KB Created: 2021-02-28 09:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6179bef72685c3994bbd332470213f32 SHA-1: e8c89e89874ac7ce85ccdbcfd8a7292e19d03bd4 SHA-256: 1f7bc829ce8717ee4503f94537a973eec2ff62435d4e97da93ac59425416688e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs points towards a campaign designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=algebra+2+graphing+quadratics+using+vertex+form+worksheet+answer+key
    • https://noverike.weebly.com/uploads/1/3/4/3/134349253/fojugaj.pdf
    • https://riwobasafogad.weebly.com/uploads/1/3/3/9/133999818/af1a7a8a5.pdf
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/laranu-jizidiwokut-nasafazerenob.pdf
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5ff8c522e4668.pdf
    • https://sopivumebisul.weebly.com/uploads/1/3/1/4/131413603/fdea64cef8.pdf
    • https://static.s123-cdn-static.com/uploads/4475577/normal_60086a3a30c16.pdf
    • https://didowivukosu.weebly.com/uploads/1/3/4/4/134470318/ximisusuwabudamanagi.pdf
    • https://cdn.sqhk.co/biwopeka/i9Cgejh/best_buy_open_box_laptops_near_me.pdf
    • https://cdn.sqhk.co/zisujidixa/gdFLgfu/snake_vs_block_coolmath.pdf
    • https://cdn.sqhk.co/mazinenik/7gdtjfP/inside_out_anger_scene.pdf
    • https://cdn.sqhk.co/fifapupifig/jiJXOZE/vivosopadategobofose.pdf
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5fd7bc19c8e9b.pdf
    • https://static.s123-cdn-static.com/uploads/4368223/normal_6002ef6fbca3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabf.bin
c8615be423992638cbabdce9dd60d6e61f8005534a3972e64331eb3da13e3a44
pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 6340 bytes
font_01_sfnt_off0000f03c.bin
667f40b97ce419b3d371a36aaba0279bfb5348c35c2e2cdd14eaafb0a5d28a27
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 9972 bytes