Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df43a9a46fbe98d…

MALICIOUS

PDF

80.7 KB Created: 2020-11-19 07:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eedbfd875dd4b572f104285e6ef9c02c SHA-1: 124d93c88635751c8b1e4d34d63f3b5f27ef9e99 SHA-256: 6df43a9a46fbe98d688eedf5ec9891e1d137f5b95e995f5ea755ad5e6b4a0e6d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and a link farm. The ClamAV detection and ML classifier further indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of malicious links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=bard+early+college+high+school
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/nisexebus.pdf
    • https://puvebimu.weebly.com/uploads/1/3/4/3/134311544/5849028.pdf
    • https://cdn-cms.f-static.net/uploads/4470402/normal_5fa7f6469ceec.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/3532263.pdf
    • https://cdn-cms.f-static.net/uploads/4419847/normal_5f964a58c4f9c.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/detew.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc4b31b4-944e-431d-ba50-b80112cc79ca/bodazimujureviriteza.pdf
    • https://s3.amazonaws.com/kikunojulejuj/zitopa.pdf
    • https://s3.amazonaws.com/lovomijelun/kusetawiragaxalesado.pdf
    • https://uploads.strikinglycdn.com/files/b44eba37-2a8e-4839-9f7f-db6b03256d92/20125713066.pdf
    • https://uploads.strikinglycdn.com/files/5e59ed77-01d3-45d2-a6e1-6c67da98a35a/vigozof.pdf
    • https://uploads.strikinglycdn.com/files/ad5f841a-97e4-458a-83e4-1385c79a1102/70244380457.pdf
    • https://uploads.strikinglycdn.com/files/5d96f922-6844-48c3-b04b-6367c45cab43/5033050459.pdf
    • https://uploads.strikinglycdn.com/files/25761c63-9e85-42fd-b776-06ba0a7f1f8f/jivota.pdf
    • https://uploads.strikinglycdn.com/files/3f92c5f2-c074-4859-8b8f-04dc1d315cce/garmin_etrex_10.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53c.bin
2bbf47536c17b3eb8d25e987fd2aca575e267f8690af96a67ccca935d0f3a8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5352 bytes
font_01_sfnt_off0000f76f.bin
a20bccec3ff2f12b2f9ffbfa57eba467c7d9fd56e89ad0fcc66d6d99c6f55508		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 11976 bytes
font_02_sfnt_off0001207a.bin
5e2eb6f7915f086535d32c224da448337ce9286d7b5ce571b06af404e5c92a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 16248 bytes

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