Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf55ab03550ad710…

MALICIOUS

PDF

73.7 KB Created: 2020-11-20 10:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48490bbe934c476a7deec4cd8f2726af SHA-1: e1810e918ba39f5dd1d10635729aa4ad8bf69889 SHA-256: bf55ab03550ad710922781f80a833aa82b2fff6b5fbbef8300523a77dbd836d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme to distribute malicious content. The primary URL identified is "https://trafffi.ru/strik?utm_term=waterdeep+heist+release", which likely serves as a lure for users interested in game releases.

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://trafffi.ru/strik?utm_term=waterdeep+heist+release
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/19f319f097a.pdf
    • https://cdn-cms.f-static.net/uploads/4425501/normal_5f9a0300e2ad6.pdf
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/nuxabiwimoniv-mexeferujut-waranala-tekomamaxas.pdf
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/6922055.pdf
    • https://cdn-cms.f-static.net/uploads/4485296/normal_5fb748a171a77.pdf
    • https://dokoxinizim.weebly.com/uploads/1/3/4/3/134305801/5907913.pdf
    • https://nurixuwabojud.weebly.com/uploads/1/3/4/5/134587723/589253.pdf
    • https://cdn-cms.f-static.net/uploads/4403259/normal_5fb621f8ae56a.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/8009155.pdf
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/tuxogali_wujulolejaj.pdf
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f96497125c7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tokatefozude/wozadu.pdf
    • https://uploads.strikinglycdn.com/files/eef41238-814e-4339-813f-d65fe35109d3/69586589622.pdf
    • https://uploads.strikinglycdn.com/files/e3ece1a6-4681-44e1-8264-3947df45c950/13806443436.pdf
    • https://uploads.strikinglycdn.com/files/e717b8e5-7fdd-4a3d-a975-04d568475824/bios_agent_plus.pdf
    • https://uploads.strikinglycdn.com/files/261bbdb8-4a3b-427b-aff7-bf35056e1f30/wajiwididoniduwimaz.pdf
    • https://uploads.strikinglycdn.com/files/639f3a12-28cb-4483-99db-1ab5a8a2d124/tepudejotikij.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6f.bin
1cb7b87c05bb63e7ebc4a06ab703f6ec94b1fa1e580d22cc9acf62d4331542f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 4632 bytes
font_01_sfnt_off0000eb40.bin
ac5b78b16ed5f886b0886e1f889eff257597d23844058a87ed5fe1a335fe66af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 9424 bytes
font_02_sfnt_off00010b6d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 4324 bytes

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