Malicious PDF — malware analysis report

Static analysis result for SHA-256 1759740cf2bd51aa…

MALICIOUS

PDF

82.4 KB Created: 2021-03-21 00:13:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d270a41d17cf77c15b8329603c0e7906 SHA-1: 799cbbcd941dfb65fb2ecb33a0b5f4924391e9ac SHA-256: 1759740cf2bd51aab021b6eed22ddb3116c848355b17014e1dd4add1bd19aea4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://golowaki.ru/wix?keyword=my+little+pony+app+cheats+gems
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/gijijowij-bivevivosupulek-jobotogi.pdf
    • https://cdn-cms.f-static.net/uploads/4427538/normal_600c49b3bf19d.pdf
    • https://cdn.sqhk.co/dulunukosep/dbuhihb/ants_performance_profiler_tutorial.pdf
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/5981faf.pdf
    • https://cdn.sqhk.co/gebijowokobe/hgPfwZt/29957618450.pdf
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/wevotogujivajejesiji.pdf
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/zesupexoburo.pdf
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fe6a2dc8926e.pdf
    • https://cdn-cms.f-static.net/uploads/4424682/normal_60276af11e58c.pdf
    • https://cdn-cms.f-static.net/uploads/4446512/normal_6054ca6f2bd80.pdf
    • https://cdn.sqhk.co/jivazufevi/2qhbjju/figimilapujonoxewisake.pdf
    • https://cdn.sqhk.co/pugirunosamo/ajijhki/77340157314.pdf
    • https://cdn-cms.f-static.net/uploads/4382186/normal_5fda64a78a9b6.pdf
    • https://cdn-cms.f-static.net/uploads/4445115/normal_604623ece865a.pdf
    • https://cdn.sqhk.co/pemenodisoda/hhjRGFF/eazylene_topup_recharge_product.pdf
    • https://cdn-cms.f-static.net/uploads/4453333/normal_6043f87b85627.pdf
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/fumufitoj_rixexepenugafu_zasawojos.pdf
    • https://static.s123-cdn-static.com/uploads/4451228/normal_5ffc1a0cb5b66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_1c4e98ba0e194766b33649bec5886231.pdf?index=true
    • https://3b3686b8-c165-4131-a013-8c457dbd4cb3.filesusr.com/ugd/97634b_2397b45633484a32a686f4a5d6d6ff3a.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_084ad13dc6124238b1f1894ab1cc071b.pdf?index=true
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_0469adcb5a5c45808bb1b12a5aac7132.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_fdae2933817d4c129427b6cf7c0302ef.pdf?index=true
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_a14d10ab5b31416f99f3a98fe637963a.pdf?index=true
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_6d28008b491748579adbde6a94c61afe.pdf?index=true
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_af34c3270c4e4cc3af681566a8e9f5f4.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_0973bc2d546a4b3e8604620cfbf9ee57.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_fa8d4b239811459282ee625eea42e1f9.pdf?index=true
    • 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_off00010228.bin
4cd28b14bdb832c3258e61bba942bda82c12589fffd1ef3cb441bd46aebf9104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 5356 bytes
font_01_sfnt_off00011453.bin
e61e0bba5808589880196bd1a2bd5a64ea943c71abee177e1cdac3fd46738093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 11716 bytes

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