Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b9b3ac7a696a11…

MALICIOUS

PDF

77.8 KB Created: 2021-06-04 08:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9132b15ea39636df8265b71441122271 SHA-1: 2cbee061a39a1a59828adf6f9bfb9a9a6c276f93 SHA-256: 60b9b3ac7a696a1156d49e3b50f69fb95ba33c82d5aaf86e1e163f78fba9c035
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links suggests a link farm or distribution network. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=convert+xmp+to+lrtemplate+reddit
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/widilaxubesipoxupuno.pdf
    • https://lefakapuwowe.weebly.com/uploads/1/3/4/3/134353253/wosabi.pdf
    • https://cdn-cms.f-static.net/uploads/4383147/normal_602af2d308db9.pdf
    • https://cdn-cms.f-static.net/uploads/4489976/normal_60460eb602408.pdf
    • https://static.s123-cdn-static.com/uploads/4496153/normal_6007ac5a64b51.pdf
    • https://static.s123-cdn-static.com/uploads/4447640/normal_600111565e99b.pdf
    • https://static.s123-cdn-static-d.com/uploads/4449779/normal_60b59ae059a8a.pdf
    • https://cdn-cms.f-static.net/uploads/4369651/normal_601b0e2192472.pdf
    • https://cdn-cms.f-static.net/uploads/4490936/normal_60462a7c627c3.pdf
    • https://cdn-cms.f-static.net/uploads/4489035/normal_6047b30adac00.pdf
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/810780fefecc7.pdf
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5fcc5389a9cbb.pdf
    • https://cdn-cms.f-static.net/uploads/4422631/normal_606e1dbd3fb35.pdf
    • https://cdn-cms.f-static.net/uploads/4500674/normal_603c3e3ce80f5.pdf
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/kovapod.pdf
    • https://fajevubesupuvax.weebly.com/uploads/1/3/5/3/135387480/6920981.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fd25962829b7.pdf
    • https://static.s123-cdn-static.com/uploads/4461511/normal_6002a7aa9ba62.pdf
    • https://static.s123-cdn-static-d.com/uploads/4392854/normal_60aff8150d5eb.pdf
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/gejef_woxituka.pdf
    • https://cdn-cms.f-static.net/uploads/4415051/normal_60631807f4190.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcf.bin
a216ec9f57ba734a1585a92b9107777863869277bf32dc3c2c56bbbff6f322c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 4960 bytes
font_01_sfnt_off0000ec95.bin
24697303d50ffc7e4202c9cc13ff5c4e328baf3e5aba6230a6e0d26efcb2d144		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 11424 bytes
font_02_sfnt_off000113f4.bin
0c82561ead172ac0e51412abe629b5944d5f81f469066018c017fef234fe4ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 16388 bytes

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