Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f99cebfcf483bdc…

MALICIOUS

PDF

77.7 KB Created: 2021-04-24 16:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2edc8e0321d26c7f99aebdb13c06f03 SHA-1: dcab3add9a4b420173a0d1efa541128d3bc13336 SHA-256: 9f99cebfcf483bdc88656c77de14917384f0a2231f05e2e8ecc4469222708a1c
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be related to generator reviews, serving as a lure. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=champion+7500-watt+dual+fuel+generator+reviews
    • https://cdn-cms.f-static.net/uploads/4384320/normal_604f047a2829a.pdf
    • https://cdn-cms.f-static.net/uploads/4367912/normal_602770622fcf7.pdf
    • https://cdn.sqhk.co/potiribuwuf/gdJwXrp/6269387370.pdf
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5fee103c98235.pdf
    • https://cdn.sqhk.co/rawatajizefu/cpkja9D/monster_jam_steel_titans_nintendo_switch_cheats.pdf
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5fc6429166275.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef76960e-af5c-4bc7-bd98-490728df9fde/12617045315.pdf
    • http://tuzikarowom.epizy.com/5927756260.pdf
    • https://uploads.strikinglycdn.com/files/d34103be-70ad-4a12-8e64-b2e6e95875d8/legurokupekutavuxo.pdf
    • https://uploads.strikinglycdn.com/files/b881ae78-abae-4676-8e77-8edb832d5108/what_does_it_mean_if_you_have_a_red_dot_on_your_eyeball.pdf
    • http://gurimatos.epizy.com/75816806916.pdf
    • https://uploads.strikinglycdn.com/files/322a9b16-6cd4-4c4d-b3c1-7a5d876aa0a5/xugevijezetubasawu.pdf
    • https://uploads.strikinglycdn.com/files/32aa7db0-6e81-45fc-b819-1c10c3b22739/como_es_una_ficha_bibliografica_de_un_libro.pdf
    • https://uploads.strikinglycdn.com/files/ccae7d6c-f3bf-4423-bf05-3389fe103683/98129852456.pdf
    • https://uploads.strikinglycdn.com/files/7b83f10f-8725-4bc0-a0d4-090670da12d8/gozeleselonegila.pdf
    • http://tunadexemuvaru.epizy.com/92023406396.pdf
    • https://uploads.strikinglycdn.com/files/c39a7943-d744-4a0e-9ac3-596afdbd6eb2/feriados_en_puerto_rico_2018.pdf
    • https://uploads.strikinglycdn.com/files/8dc58f5e-a8c4-4076-a673-bb603bef3b88/cnn_news_us_presidential_election.pdf
    • https://uploads.strikinglycdn.com/files/f5b7ed22-b8d5-429f-a954-ecdf927a1965/flash_nikon_sb_600_manual_portugues.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_off0000efa9.bin
936503167de12e0da74ae5508b11f348ea8923d3c0de96dde9ca252feceb7e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 5888 bytes
font_01_sfnt_off000103b6.bin
a6a085d9ec284807c940796aa01817293af497cb20ed2bc08abc771d6003d7e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 11172 bytes

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