Malicious PDF — malware analysis report

Static analysis result for SHA-256 390ddb00f48a4f39…

MALICIOUS

PDF

70.1 KB Created: 2021-03-26 06:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26c54527d25f67a95651ba3db0de6eee SHA-1: 157c60b3cdc1dda8697bc6e58aaa07bd8a4279da SHA-256: 390ddb00f48a4f398d4710028b72ff079e981ac5f96676b968db49771ae503cd
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 other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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-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/award?keyword=although+even+though+however+exercises+pdf
    • https://cdn.sqhk.co/kepigofunet/gdiajeH/xadebenuborubakas.pdf
    • http://azorocheat1.xyz/how_to_start_a_planet_fitness_franchisejgngj.pdf
    • http://tusukezilineji.66ghz.com/kewodekesiv.pdf
    • http://makamar.online/famejedegabukavubiwm1phk.pdf
    • http://plsale.pro/arma_3_exile_base_raiding_guide8p0wr.pdf
    • https://cdn.sqhk.co/kupawusel/tgihi3i/62923124761.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_c7ddd939ff2641e9a30a409924b6362a.pdf?index=true
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_16017affa3ab45f6ae3c387473ae9ceb.pdf?index=true
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_0e4bc10b350a49549fcd0c85525721ac.pdf?index=true
    • http://zilisugifep.epizy.com/how_to_fix_garage_door_cables_video.pdf
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_e267dcb1be5b4a1cb316f357b9bed124.pdf?index=true
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_80a38fcb311c4b53864e29cfbe365366.pdf?index=true
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_cffeee2c55ef4ee1a326042303b9c292.pdf?index=true
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_d31a6619abf24953851bc61c566751e9.pdf?index=true
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_3546bc418d354a0c80efaf34d68790ee.pdf?index=true
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_441b3da2622f42528a763f49c4ec6b9b.pdf?index=true
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_20c07ed8078042e393bbd66d15522482.pdf?index=true
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_d4909eb005de41e4b984764cb6cee49b.pdf?index=true
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_0630bc8691ef4d0eb7b12951ab897a88.pdf?index=true
    • http://gobiburitumeri.epizy.com/aithi_karaya_song_hiru_fm.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_off0000d5eb.bin
75c8aa2d6236343ce568fa032dc0c9c377e88977e81193c8edaa980560ececde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 5416 bytes
font_01_sfnt_off0000e875.bin
02040cc34a8e1fb6ee8a165f7e6fcbf3d2e574891d552a52574e4ed4169bbbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 10116 bytes

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