Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fc6a88741dbf18…

MALICIOUS

PDF

76.8 KB Created: 2020-11-17 07:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22bedb5102dd3d67c9af773df2838ddf SHA-1: 1f1e7fec5d96d07ba25aa6f44848ca1b06084923 SHA-256: 74fc6a88741dbf1879e42731057f8a43b919abbe668008d02a0b86cd2c334b22
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely involving the download of further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=minthe+and+hades+lore+olympus
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f91f495b5bc3.pdf
    • https://kukuziso.weebly.com/uploads/1/3/4/4/134468315/kobikupapavu.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdf
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/voleba.pdf
    • https://virukuzababije.weebly.com/uploads/1/3/4/3/134350100/6c17be49f22e.pdf
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5fa317cae25ef.pdf
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5fa71ed100123.pdf
    • https://kinumonitebira.weebly.com/uploads/1/3/4/6/134605003/luniteziro_wibaj.pdf
    • https://samoxaposem.weebly.com/uploads/1/3/4/3/134361226/b7481.pdf
    • https://wifusewaxoxuxi.weebly.com/uploads/1/3/4/4/134497844/fukobofasake.pdf
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5fab5fc878285.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dojonuta/optiplex_7010_manual.pdf
    • 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_off0000f0ba.bin
51444a56ebf958f04aedef9f9d2e7e46953c98bf98cc7382fd14b25d3c3c100a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 5304 bytes
font_01_sfnt_off000102ae.bin
fbf4d71cd0296516c65b097beb6bdc2e356b10015fcacf39144bee3a98ea6a08
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 10620 bytes