Malicious PDF — malware analysis report

Static analysis result for SHA-256 73dc6f48773577a2…

MALICIOUS

PDF

70.6 KB Created: 2021-03-15 01:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a15dc48eca32f6f5c9f185e49b48d50 SHA-1: 78825d2806c214d7c1cf34ce6c0d8c55ff8d2782 SHA-256: 73dc6f48773577a220e01bb58bec65013b0786f7036adcfdfcf384508a94cd82
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to further malicious sites or downloaders. The presence of embedded URLs and the overall structure point towards a phishing lure, potentially disguised as a guide or informational document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/123?utm_term=katarina+guide+pro
    • http://eslivdrug.space/55225627602oj8cn.pdf
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/8897748.pdf
    • https://cdn.sqhk.co/bonirixa/jabdvhg/letileweledajegu.pdf
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/ninon-sosezigo.pdf
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/9a278aac47ad71.pdf
    • https://cdn-cms.f-static.net/uploads/4495039/normal_604e5c5120efc.pdf
    • https://zoliparudoluja.weebly.com/uploads/1/3/4/6/134662317/5332412.pdf
    • https://cdn.sqhk.co/wirowanorax/ZTDMdO0/ordinance_meaning_in_tamil.pdf
    • https://cdn-cms.f-static.net/uploads/4473039/normal_5fda2075beaf6.pdf
    • https://cdn.sqhk.co/fidapulano/Bgehigg/entrepreneurship_development_and_communication_skills_download.pdf
    • http://optamorem.com/animal_jam_hack_no_human_verification_2017zqprb.pdf
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/1b241bfc537.pdf
    • http://stankoff.org/83291287749aw5x5.pdf
    • https://cdn.sqhk.co/febapaji/gelSgcE/xakurixevopa.pdf
    • https://cdn.sqhk.co/jetekujob/Vk2stif/64309125975.pdf
    • https://cdn.sqhk.co/bezakebijuk/jTgajjZ/lijegugijefedukinob.pdf
    • http://muldwych.com/all_american_pressure_canner_921_canadaba9zo.pdf
    • http://formverifiedbadge.com/74591878855sjge8.pdf
    • https://cdn.sqhk.co/mipekakiri/a5hKhkK/83785766886.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_5c033e4b68d44e3d886c0d63c22ff62a.pdf?index=true
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_15b38e1e58a746909deb303c5b4d658a.pdf?index=true
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_9505937630134fbc93f5d7e46b477608.pdf?index=true
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_6e600c9adf174dd8accb0fcbb2c786cb.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_off0000d6c1.bin
dc1f05c77a9bde9e821ceaccd4791607921b79cd65bd561e07606e834e94b6ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 4884 bytes
font_01_sfnt_off0000e775.bin
507cb01b430ef6d927249258017f2b6af5fcbe009ed2fe100ef78e376592175b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 11212 bytes

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