Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a188b1489ec7e38…

MALICIOUS

PDF

68.8 KB Created: 2020-12-23 02:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0cd42fa531089c0b12f080d89d8f686 SHA-1: 1c0f0c82662deb8d9f3aadc188566e67da6c8076 SHA-256: 2a188b1489ec7e38eb8460b89758fbc991c163afd361ad80721dbbb18f4e0cb4
156 Risk Score

Malware Insights

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

The PDF contains a large number of 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 maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme, likely leveraging a spearphishing attachment vector.

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-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://trafficel.ru/123?utm_term=vehicle+dependent+expedition+guide+pdf
    • https://daletapobuwero.weebly.com/uploads/1/3/4/6/134666872/4553160.pdf
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5fbf5d8280997.pdf
    • https://kilesikawagex.weebly.com/uploads/1/3/4/3/134372597/warinudi-redewoki-lexoxepamabow-vabifibu.pdf
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f93f8c94784f.pdf
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/zigam.pdf
    • https://tedojumutu.weebly.com/uploads/1/3/4/0/134042579/mosapovolu_wulanedama_wakofidap.pdf
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/c666d94e44.pdf
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/sonojepejixifagem.pdf
    • https://cdn-cms.f-static.net/uploads/4476445/normal_5fdb5feceb3f6.pdf
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/baff82d92cbf3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanebavifamopez/3204915978.pdf
    • https://s3.amazonaws.com/pajukovuxetu/zipizapatetitaxiwup.pdf
    • https://s3.amazonaws.com/tozaduliwubega/18730634999.pdf
    • https://s3.amazonaws.com/pafexegud/under_armour_compression_shirt_size_guide.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/7026616002.pdf
    • https://s3.amazonaws.com/genedonapubefe/wowuzafevidalisovonepuxaz.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_off0000cf2c.bin
b6cadce195582e55e3b07937c69f95c658447f4cfc70dd0f11ce3fd548a1a628
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 4968 bytes
font_01_sfnt_off0000e02a.bin
cc7c53a066bd21fd3d8825bc295b0d1fa73f23bcf1172de97b65bd7352fee828
pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 11352 bytes