Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05c85c3da9982db…

MALICIOUS

PDF

111.4 KB Created: 2020-11-19 21:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6858a055f504f9b81b3ce0c87c3e49b SHA-1: 1d5e17c4fd415fb6d97b362029e95fb00b56c041 SHA-256: f05c85c3da9982db87a31d126b7b44a9e333d6754cd15b1db2ce96bf701ed10c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly 'trafficel.ru', are likely used for phishing or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafficel.ru/123?utm_term=hilti+kwik+bolt+tz+ss+316
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fb2fea7a9fe4.pdf
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f91b14910a73.pdf
    • https://cdn-cms.f-static.net/uploads/4389820/normal_5fa43a2482acf.pdf
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5fa61f258e8a1.pdf
    • https://feresaxeto.weebly.com/uploads/1/3/4/6/134609658/0dd5f69e5bc6.pdf
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f8743e3591d3.pdf
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5fb5b5384cfa0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/wizidimawag/61961679711.pdf
    • https://s3.amazonaws.com/buponuwebi/94434762658.pdf
    • https://s3.amazonaws.com/gofiguj/vigan_ilocos_sur_beach_resort.pdf
    • https://s3.amazonaws.com/bibejovixapis/95564141489.pdf
    • https://uploads.strikinglycdn.com/files/01516ca6-8b59-4dfe-adc0-3debefc43877/repamodovofavokotere.pdf
    • https://s3.amazonaws.com/gogoxowiniza/matthew_hussey.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
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a2d.bin
d79750bb2f20a3ba9bb930b6b4b31105ffbe3c34e59909da052283356c1a5161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 3220 bytes
font_01_sfnt_off000145a3.bin
3946c7a64a7e048fc6d6b98b1082ceb4165f140a1e279959eb1c7355f82865f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145A3 5048 bytes
font_02_sfnt_off00015701.bin
d315631624845d767e8eefb1c373e4e883a0eb50fe06d181f9ec891ada23e59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15701 2048 bytes
font_03_sfnt_off00015fd3.bin
4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD3 6148 bytes
font_04_sfnt_off00016fb4.bin
a87fe58b3581950cd9fc8f041bdfdef44e4ced7a8f1f67f1819194f69feddc2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB4 12824 bytes
font_05_sfnt_off00019906.bin
48f515d49a265d3cec15dbd2d5f47ba1c49b14e3908a9c859c3ba8f821ef457d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19906 16068 bytes

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