Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b37ac3df2564554…

MALICIOUS

PDF

109.0 KB Created: 2020-12-15 18:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d50b49d5bbb0422099c2c7e5a483c82c SHA-1: 1d62da2bed248f25febaf022edf2c8249cf3500d SHA-256: 1b37ac3df256455438a1409d6f5193a65a38802793ff2c16941093a2cb485268
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, including one to 'trafffi.ru', suggesting a link farm or phishing campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate an attempt to redirect users to potentially harmful websites.

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-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://trafffi.ru/aws?utm_term=3d+video++free+mp4
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f973b0ab419e.pdf
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5fca4fb2d7c46.pdf
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5fc1eca1aeb9b.pdf
    • https://cdn-cms.f-static.net/uploads/4476930/normal_5fb351225d6e1.pdf
    • https://cdn-cms.f-static.net/uploads/4444852/normal_5faa7fca37a50.pdf
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8e0f757bd9d.pdf
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/1857ee6db63.pdf
    • https://cdn-cms.f-static.net/uploads/4465249/normal_5fbcd5eeed5de.pdf
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/afe4c375e63e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3f371605-c3ea-4713-b16e-d7d09145cc92/78113140048.pdf
    • https://static1.squarespace.com/static/5fc6449c6b97992eb5800a9b/t/5fd5f0d813a48350e806ffdb/1607856345237/sevobikonudilunat.pdf
    • https://uploads.strikinglycdn.com/files/68d2cdd8-21a5-4c92-953f-40258af18039/ejercicios_resueltos_matematicas_6_p.pdf
    • https://uploads.strikinglycdn.com/files/e8852b53-7bd4-4ad6-bf3e-ea2d9eff9a4a/sawuxokulizekawus.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b9e.bin
611f3db65d644b1c54ca9459fd1b922419f4f90529f892feeb7d4571f542e8e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9E 6568 bytes
font_01_sfnt_off00015bed.bin
4cecbd87f56043250216355309e1f7001450d72e6af2b17e0827878d6a4d8286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BED 4984 bytes
font_02_sfnt_off00016cdf.bin
ed046257b6b1867a2d32be2e216c983bd0d56457ff5f49709b87f20ba1a6d5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDF 10624 bytes
font_03_sfnt_off0001911c.bin
366a80b5f7a113509e982b0659693ed928cf6d032ca46794d8c0a8e43239e44b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1911C 16236 bytes

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