Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc485fa0559087f…

MALICIOUS

PDF

77.2 KB Created: 2021-03-09 13:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b82d8958bc9b92a6ed80405da113200 SHA-1: 7f9a6e4a0acd77acd12be77fba5b090a1fbfa18d SHA-256: 6bc485fa0559087f95a13036b9889b34076ce2773ee2bd4c323832257d6844b0
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 disguised as PDF files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

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://dafemum.ru/strik?utm_term=marantz+sr7010+firmware+update
    • https://cdn.sqhk.co/rasetiwulipu/i0flMie/fallout_shelter_mr_handy_repair.pdf
    • http://mosquito.codes/vegawevabibirogelargf.pdf
    • https://cdn.sqhk.co/zidodovare/wGgiUkb/funny_dog_gifs_clean.pdf
    • https://cdn.sqhk.co/munemuzabuk/gAhf2jg/define_hero_essay.pdf
    • http://evromotors.net/diazo_carbene_formation5iyws.pdf
    • https://cdn.sqhk.co/vimexuda/lgjii7B/72904505438.pdf
    • http://ionatr.fun/sedofejisixatoqhz89.pdf
    • http://premiumpornclips.com/55218514054t0om7.pdf
    • https://cdn-cms.f-static.net/uploads/4501385/normal_601174681fae3.pdf
    • https://cdn.sqhk.co/sojowidaz/ajg2jdQ/napafa.pdf
    • https://cdn.sqhk.co/tevunufoba/igNFrgf/dead_city_gameplay.pdf
    • https://static.s123-cdn-static.com/uploads/4421641/normal_5fcc9ebe039ae.pdf
    • https://cdn.sqhk.co/xusarukave/h9gugjS/flying_arrow_archery_toxic_broadheads.pdf
    • https://cdn.sqhk.co/sesexibanobu/9RjcjBL/xukesi.pdf
    • https://static.s123-cdn-static.com/uploads/4392470/normal_5fece95a71d9a.pdf
    • https://static.s123-cdn-static.com/uploads/4426816/normal_5fec6cca8999b.pdf
    • https://cdn.sqhk.co/kawabewiwof/bYG3tUY/vepakoletakipetuf.pdf
    • https://cdn.sqhk.co/domonuxasi/hijbnVQ/97707978864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_9d84c3e970aa4e819898c82d93cabc11.pdf?index=true
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_fab752dacf1a4a7bae421016d58b4912.pdf?index=true
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_5be41f7c87444e65ba38837e03bc1abe.pdf?index=true
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_3733925855b34168a0aebcdc29dbccd4.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_off0000ee1b.bin
7a6bf6f2ac1f540b249a949e0d9d32007c3065bcd303383630f3b89b0a94a74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 5576 bytes
font_01_sfnt_off00010127.bin
889970933e16ca87883474e27342cd89ea7f213ae6daa579629c9d9c0ff59107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 11380 bytes

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