Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f259a4796a69bb…

MALICIOUS

PDF

69.0 KB Created: 2020-12-30 02:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41fce9d4be543a767798f0c8eeb2a54e SHA-1: 1c63661878fc49e61396b3d051e2c51bfe50ac94 SHA-256: 87f259a4796a69bb7de05720612632708be993fabf66ab65cab54a0147c052e8
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary malicious URL identified is `https://traffine.ru/strik?utm_term=road+trip+movie+download+in+tamil+isaimini`, which is likely used to direct users to further malicious content or phishing sites.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?utm_term=road+trip+movie+download+in+tamil+isaimini
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fd7a585ec187.pdf
    • https://cdn-cms.f-static.net/uploads/4403428/normal_5fbf35c60c44c.pdf
    • https://static.s123-cdn-static.com/uploads/4460709/normal_5fcd7ea652262.pdf
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/gixozud-fodewi-gevulug-lurefesa.pdf
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5fc221be432dd.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5fe7efde70782.pdf
    • https://static.s123-cdn-static.com/uploads/4484370/normal_5fcf6d837de3b.pdf
    • https://static.s123-cdn-static.com/uploads/4503524/normal_5fe4fb4a7b9a0.pdf
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8d25f013691.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3eace981-4feb-4305-a200-3cd4bc386825/80933162439.pdf
    • https://uploads.strikinglycdn.com/files/0b2cb747-3ac5-4988-b7b8-8e5ec900e360/piwifidovodoraf.pdf
    • https://uploads.strikinglycdn.com/files/46301b8e-93fa-4980-9a65-37290b1808aa/16328380142.pdf
    • https://uploads.strikinglycdn.com/files/73346066-957b-4582-8bfd-2c0cc654aee2/trolls_movie_online_dailymotion.pdf
    • https://uploads.strikinglycdn.com/files/b80c06e2-e93e-42ab-82fd-4d033fb5cc1b/missed_buzzer_beater_gif.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_off0000c4ce.bin
7e3d59ee5a7e503e6cecd5b5a0cbe3dae00a8d8e9969dff865b11937e0a17d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CE 5264 bytes
font_01_sfnt_off0000d6af.bin
73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 1936 bytes
font_02_sfnt_off0000dff2.bin
189eb5493aa137925c659275e310d418e039597e09cc3ba728dd01d0e40630a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 10764 bytes

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