Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3197cece0dab6d0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 21:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69435849c49322db592445f0753882e7 SHA-1: 906c9182f7af7ea4ced5bb3260127398f57b094a SHA-256: d3197cece0dab6d04869fc5d4c279662ea6b99bb23f7e63e3f8746da61c52928
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=focal+subwoofer+12
    • https://laxukiwu.weebly.com/uploads/1/3/1/0/131070933/4f68a54d988c.pdf
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5feef0f819c6a.pdf
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/noriwotezerakapulot.pdf
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/minevirix_sukabomupegav_naruxanowixo_redukapofux.pdf
    • https://fujemolubese.weebly.com/uploads/1/3/4/0/134012375/3b7cac7d348625e.pdf
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5ff90cae85fc3.pdf
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fc720a21e0bb.pdf
    • https://fofomakizu.weebly.com/uploads/1/3/0/7/130775640/dagegatakilox.pdf
    • https://fibupodofakakov.weebly.com/uploads/1/3/4/4/134496100/tuvaworeka-nerovibog.pdf
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/8adec94a73.pdf
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/rafowa_kofewiju_tevum_wafolalu.pdf
    • https://retinagarar.weebly.com/uploads/1/3/4/3/134319249/monezubo.pdf
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/8345481f.pdf
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fc853da642fa.pdf
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5feb00c87d48d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mogipegi/greenwood_sc_weather_report.pdf
    • https://uploads.strikinglycdn.com/files/f2485824-9192-4ea9-a41e-6ef73ff43f58/zixexuvadimilofiku.pdf
    • https://s3.amazonaws.com/megujobemegor/is_metal_gear_dead.pdf
    • https://uploads.strikinglycdn.com/files/fd79c324-6c6e-42fe-b3be-42295f7f67b7/43866966912.pdf
    • https://uploads.strikinglycdn.com/files/16f339c7-a9dd-4fb6-9516-e9712f0971cd/is_dyson_v11_better_than_v8.pdf
    • https://uploads.strikinglycdn.com/files/a4a58200-5e70-467a-a381-604a30d5cf6d/27260288862.pdf
    • https://s3.amazonaws.com/nitatotol/rebilizinaruwisu.pdf
    • https://s3.amazonaws.com/kibavutibeved/coding_questions_for_beginners_in_python.pdf
    • https://s3.amazonaws.com/falevi/fenurolarowatusekajepew.pdf
    • https://uploads.strikinglycdn.com/files/9c7a0de1-0921-4e2b-8818-5fe4fbbf28a2/faliwiriwenuzasu.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_off0000eb84.bin
ef64008df18b5eb12c65c0cb0fd33cd5331b51ad1c8e233587438e6ba8bbb5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 5248 bytes
font_01_sfnt_off0000fd88.bin
77da51d87664ed85f89bf9198eea88c833e0b6565b4ade6318b71f73a4b8e9b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 11620 bytes

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