Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef793a2c002b9976…

MALICIOUS

PDF

76.8 KB Created: 2021-03-12 07:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b1ad10e10af699c47cb2b14cdd94795 SHA-1: b666493898af3df35a1c828d27aac580a0885275 SHA-256: ef793a2c002b9976cf6cc01a1008d12856d165ca33b6d488b19fbafd2cf2d7dc
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 point to suspicious domains, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=attaches+the+lens+to+the+ciliary+body+pdf
    • http://ig-soft-team.com/numumutogivipalekugogaxhfh4e.pdf
    • http://keepmaxi.space/word_attack_two_player_gamescnko3.pdf
    • http://idealica-official-it.website/hp_officejet_pro_k8600_printhead_cleaningc99en.pdf
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/4615989.pdf
    • https://rutesobob.weebly.com/uploads/1/3/1/8/131856950/6486199.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/sivapotumaxarelazadebyr24.pdf
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/6879626.pdf
    • http://milanomodaitaly.site/pejinapaxuxozasuznhou.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_c869b32d720c4a0e8af28b0ae1409453.pdf?index=true
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_ae00399e76e0483ea07fa44c253350a4.pdf?index=true
    • http://wetosevezobesof.rf.gd/public_sector_financial_management.pdf
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_0040aec85e5748f79451b4bf297def08.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1418a3ee-a523-4451-b0e4-1ad59452581e/when_did_stephen_king_wrote_why_we_crave_horror_movies.pdf
    • https://uploads.strikinglycdn.com/files/85f3847c-2c70-49a9-8629-1327b8e9e1fc/what_is_the_average_molecular_weight_of_a_protein.pdf
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_6ae317126bcd42d3a41bc78fb3048e9c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4bd3aba9-b374-4105-9c90-85d6daae4f35/97163644877.pdf
    • https://uploads.strikinglycdn.com/files/4f244cbb-feee-4b59-81b8-01706b0cb1ed/city_of_bones_michael_connelly_plot.pdf
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_104d81cd937a48c781bd4bea94baddf2.pdf?index=true
    • http://gelulunex.epizy.com/starcraft_brood_war_cheats_pc.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_off0000f0f9.bin
531928db3f81710aa3c1245739a7e0e40f1f081379eceead5858fc67babdcdc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 5472 bytes
font_01_sfnt_off00010392.bin
e97728d6134bd9220387118ab7c90c13d978644a38687bded93fd8a4659bc7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 10064 bytes

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