Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fba4b0d45ac5b2…

MALICIOUS

PDF

94.5 KB Created: 2020-12-24 18:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a9e2b4ac9e13d8e6e8e69bf63961ac3 SHA-1: 7ff0e1d03da51ef8917b99f805f40c67beb8c786 SHA-256: 41fba4b0d45ac5b259d93cd63a320bca8d8b2368aa180a5320d5395ec65e9ab7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external PDF links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggests an attempt to manipulate search engine results or redirect users to malicious sites. The primary IOC is the initial external URL, which appears to be part of a link farm.

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://trafftec.ru/aws?utm_term=arifureta+novela+completa+pdf
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5fa9cbb9517e2.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/18ad995.pdf
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fa7e767af805.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fc0d7beb5eb6.pdf
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/xumazu.pdf
    • https://cdn-cms.f-static.net/uploads/4495269/normal_5fc2bd0e30917.pdf
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd2c76767e9e.pdf
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/6aceee764.pdf
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/lafamataw_wafidit.pdf
    • https://cdn.sqhk.co/lerotakisisa/SSib6gg/rekijojopopunobus.pdf
    • https://logukevagas.weebly.com/uploads/1/3/4/5/134507161/bfa419b95.pdf
    • https://guwixuwekolarap.weebly.com/uploads/1/3/2/7/132740580/tigovejudewikuf_fawofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67c3f595-db68-41fd-92b6-71af4e5dbad7/19223073769.pdf
    • https://uploads.strikinglycdn.com/files/7927d250-f0b5-4834-b86b-ac58daebd038/wapekosidemaze.pdf
    • https://uploads.strikinglycdn.com/files/ad3dd073-c9ba-4fdb-a15d-dc17dfb8093b/gemowor.pdf
    • https://uploads.strikinglycdn.com/files/f7b525f2-2872-4dbe-aa69-0ce437c92aac/fang_dragon_5e.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff96.bin
ac9bb4121555c8c523af6383764b99e5fc43dd4dcfc8f5ac344a4d2e65b08b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 9336 bytes
font_01_sfnt_off00011e56.bin
12fea73c1403509a2797c8cde3c44b65d9777f13e93731522fce01ba411dcdc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 5172 bytes
font_02_sfnt_off00012fe1.bin
6858be044c6bbdbdc1e51f1f266ff9e84dd19ae89fc27e1a35fb3fbcf1f2cd48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 11772 bytes
font_03_sfnt_off00015730.bin
e428de66ceb9deebdb53ebe71febfe16dde38f113f03500bd416f391f33c23f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15730 16164 bytes

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