Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2a38751967f67d…

MALICIOUS

PDF

81.3 KB Created: 2020-11-23 15:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f8d9b54bdcdfea2de7d4932e9641bc3 SHA-1: 7d2bc5a552fcfaeee89d320cb45114b0d118c6c3 SHA-256: ba2a38751967f67d0d798946187e45be5ee6a96e2d40b834e0e9bcdede1aabbc
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'Validation master plan example pdf', likely a lure to encourage downloads. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/aws?utm_term=validation+master+plan+example+pdf
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5fad87f32aebd.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdf
    • https://sudogela.weebly.com/uploads/1/3/4/8/134846286/bceb555965e.pdf
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/5389017.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/zepux-zidaru.pdf
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f9212ec4a9d5.pdf
    • https://kazodorog.weebly.com/uploads/1/3/4/9/134904699/1b5ef2d02df6.pdf
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5fa814c459a52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/98e7eab0-98bd-49cb-b3c6-32b329407a02/pixawarikewolan.pdf
    • https://uploads.strikinglycdn.com/files/e6366f61-68ef-44c2-89e0-726cb1b0ef57/91588992907.pdf
    • https://uploads.strikinglycdn.com/files/40bc5e77-7927-425d-90a7-1ce3a058bee6/97610508183.pdf
    • https://uploads.strikinglycdn.com/files/09720c38-ea14-4914-945c-c18fc82574ea/veluwarukelubowikisulavo.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_off00010263.bin
cdae716c476384b5e2ffb81799cf8646fbe8819113dbab46b93a16b6987b5788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 5220 bytes
font_01_sfnt_off00011417.bin
b479e255d888fa7dc3fe9941bb7a8ca979b5310055011b5bbac1c902dcf6a4f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 10764 bytes

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