Malicious PDF — malware analysis report

Static analysis result for SHA-256 3738ff3c947c0602…

MALICIOUS

PDF

65.2 KB Created: 2020-11-18 01:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48fccd911fe648b61d1e81ec50bb76b1 SHA-1: d6bee46e094c39b52ce1bca13a740215367d2e95 SHA-256: 3738ff3c947c0602bbe9765d7699a40ae960f21866142c6aacb781bd13769783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical finding for a link farm containing 28 external links, and a ClamAV detection for Pdf.Phishing.Trojan. The ML classifier also returned a high confidence score for maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing sites.

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-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://trafftec.ru/123?utm_term=blue+tiger+headset+reviews
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/a7c2f2d2a0276.pdf
    • https://regujume.weebly.com/uploads/1/3/4/3/134339948/8471334.pdf
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/3594046.pdf
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/35e4d.pdf
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/1735472.pdf
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/kuvidusaronemib.pdf
    • https://gebedevalofibut.weebly.com/uploads/1/3/4/3/134379687/wubivegubufaxa.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/dowubuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5f1ab47a-37a2-4acd-b803-3071e125d7b7/nevada_arrest_records_free.pdf
    • https://uploads.strikinglycdn.com/files/83262da2-fc14-4d8d-9f7e-2835f5aa5167/mario_64_randomizer_seeds.pdf
    • https://uploads.strikinglycdn.com/files/628331cb-16e1-488c-ba5c-e28b8107b774/94511129622.pdf
    • https://uploads.strikinglycdn.com/files/76009fde-8b84-4305-b53e-00ad8284ab55/lutibo.pdf
    • https://uploads.strikinglycdn.com/files/9c029a32-0d52-4bfc-8fc6-eb312615be83/creating_and_solving_equations_lesson_2-2_answers_worksheet.pdf
    • https://s3.amazonaws.com/fasanag/causes_of_the_american_revolution_worksheet.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_off0000b553.bin
87bb7b411d5d554112d69c2e440988ad5d0c98003211be98ed607fd6ae4e633a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 4956 bytes
font_01_sfnt_off0000c64f.bin
a58895c06811cf3971498fe62b8eafc76531ab9a87762010a21671b12129aa39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 10412 bytes
font_02_sfnt_off0000e9e6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 4324 bytes

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