Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c44f5ddf906f753…

MALICIOUS

PDF

80.5 KB Created: 2021-03-27 22:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95d2c6f71f552f4184f08fa917a922a2 SHA-1: 231d8a6f2001a9b9e7e3fc4f5a6e2e9eb57b68b3 SHA-256: 6c44f5ddf906f753fc3edd056ab365e99d2e4163fe185930dd123d19d664f2bf
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One such link, https://botokaw.ru/123?utm_term=marvel+ultimate+alliance+3+gameinformer, is directly referenced. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=marvel+ultimate+alliance+3+gameinformer
    • https://cdn.sqhk.co/wituwuxevef/iexKBUi/ludo_star_2_online_laptop.pdf
    • https://static.s123-cdn-static.com/uploads/4450247/normal_5fe3d913524a0.pdf
    • https://cdn.sqhk.co/xizefonuma/OTQji9E/halloween_costume_ideas_diy_last_minute.pdf
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fece66ebac46.pdf
    • http://beweroxaku.66ghz.com/bad_bunny_songs_free.pdf
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5fce65ba448e1.pdf
    • http://tutixiluvik.22web.org/82366511458.pdf
    • https://cdn.sqhk.co/zuvifilezaja/4Qsjhhm/sivefoko.pdf
    • https://cdn-cms.f-static.net/uploads/4394082/normal_602988aa23aff.pdf
    • https://cdn-cms.f-static.net/uploads/4369788/normal_6030324c4d93a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/477eeaf8-1332-49af-a5fd-5e99dad3916b/how_to_assemble_kallax_shelving_unit.pdf
    • https://uploads.strikinglycdn.com/files/36ad9d62-b34b-4445-839f-59ceb0ee6634/famodevoxavaxadu.pdf
    • https://uploads.strikinglycdn.com/files/39755f5b-cffb-4a29-a248-102c615682ef/25796253084.pdf
    • https://uploads.strikinglycdn.com/files/1998b630-7f6d-4220-b8f4-db6299ee603d/wolirarufebawida.pdf
    • http://lalafen.epizy.com/mopevatupasabonedapod.pdf
    • https://uploads.strikinglycdn.com/files/371e6738-a318-4e60-bb71-a3496255fba3/7685991494.pdf
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_ff1f0a33a7a043b483c348eeef82008f.pdf?index=true
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_0836d91b0cf344fda64aeea9a6fa0e92.pdf?index=true
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_d5f5b1651270443589237f8fb8913fc0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7ef8aa67-cc7c-4083-90c7-a97fe9a58a07/safety_1st_baby_monitor_08024_manual.pdf
    • http://xupasafagimi.rf.gd/rexikezodita.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_off0000fd8e.bin
3ae2c89e6f97c33c83aaff011f5826609d66133553f8810ebff952f1297dbf2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 5252 bytes
font_01_sfnt_off00010f71.bin
9897d33d963148990d38b1f2d0b9ec3064e323de9869f688f5591e2185391106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 10928 bytes

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