Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c436442eece7db…

MALICIOUS

PDF

75.6 KB Created: 2021-01-01 04:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fc3009583ea60d66e4cef25e1dccab2 SHA-1: dc33c0cd0d40ef78e110c52bf7b4c248cee248f0 SHA-256: c5c436442eece7db6f2cb5cfaa2f0506ef00b9da2d992f50dd90d481ac167030
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, likely for SEO manipulation or phishing. The primary malicious URL identified is traffset.ru, which is likely used to host a second-stage payload or redirect to a phishing site. The document body, though heavily obfuscated, contains keywords related to 'washer and dryer sets home depot', suggesting a lure for users interested in such products.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffset.ru/strik?utm_term=stackable+washer+and+dryer+sets+home+depot
    • https://cdn.sqhk.co/kuzosexiwugu/IGgegdY/sonud.pdf
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/6037409.pdf
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5fb9a3142dd71.pdf
    • https://vuxomikegivu.weebly.com/uploads/1/3/1/4/131453843/sijef.pdf
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5fd09a576c9e7.pdf
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5fb9dbf1ce453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ladiwuzetawedi/lux_1000_thermostat_manual.pdf
    • https://uploads.strikinglycdn.com/files/7a8a00f4-afc1-4e4c-9f02-aa28a872f37e/deutsche_verteidigungs_dienst.pdf
    • https://s3.amazonaws.com/susopuzupure/75146596515.pdf
    • https://s3.amazonaws.com/dejazuvorira/81834268184.pdf
    • https://s3.amazonaws.com/midipes/tu_commands_in_spanish_worksheet.pdf
    • https://s3.amazonaws.com/tunenijexe/jabowigazavaxa.pdf
    • https://s3.amazonaws.com/muxozuvalubi/66021583476.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_off0000e7a9.bin
66c875f7d1d623f017b15d792ddc3f6b6234fe0eefb65a217bd72b2885721eca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5812 bytes
font_01_sfnt_off0000fb5e.bin
3036f23782998f86caeb06306896da6d8f5321fe99546f2a36cbf038389269a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 10796 bytes