Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a8d5b582c0b93a…

MALICIOUS

PDF

82.2 KB Created: 2021-03-19 15:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf3aee6221505b9d3ce7dde8539cd724 SHA-1: 29fc0da325f23acd0cf68c4782ada7d7c547fe20 SHA-256: 64a8d5b582c0b93a7caac0abe6c814632c36389b9ae05e64a9eabc70d7534fa4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=7+habits+posters+free
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/9ce366d0453.pdf
    • https://cdn.sqhk.co/ketejeti/GGahghd/is_carnival_cruise_lines_sailing_right_now.pdf
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/zezewo-xitoxejagi-kubomomedipim.pdf
    • http://kiguporut.iblogger.org/32297982603.pdf
    • https://cdn.sqhk.co/dasisogi/gicwtie/today_breaking_news_nyc.pdf
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/3720020.pdf
    • https://kinumefiboposif.weebly.com/uploads/1/3/4/8/134865532/wezimotunijiwikiw.pdf
    • https://narezivif.weebly.com/uploads/1/3/5/3/135307162/fuzapiduva_kepeti_berigeguvuguwof.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/7185969.pdf
    • http://gewebufokorilu.iblogger.org/bacterias_patgenas.pdf
    • https://cdn.sqhk.co/gepeduvo/OKTifjb/gibazuwiwajipejizuwejokuf.pdf
    • https://dodizavezoku.weebly.com/uploads/1/3/1/3/131398251/lalixol.pdf
    • https://domekemukud.weebly.com/uploads/1/3/5/3/135327345/6149093.pdf
    • http://zipezaronin.iblogger.org/fobudalotopebotixurogu.pdf
    • https://cdn.sqhk.co/wogokodu/jjbgdtO/zombieland_2_free.pdf
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/kiwiza.pdf
    • http://trokot-new.online/92109222042zeed0.pdf
    • https://cdn.sqhk.co/sesizame/T3hbvjb/47590788038.pdf
    • https://ruxiwinovisas.weebly.com/uploads/1/3/5/3/135313790/niwotiwomevo.pdf
    • http://pink-echo.club/8908666292884c9o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bumilamufitilu.epizy.com/citra_android_emulator.pdf
    • https://uploads.strikinglycdn.com/files/9403d0d2-68f9-430f-888b-7b7935047282/zobulatasawad.pdf
    • https://uploads.strikinglycdn.com/files/0bf56b05-98db-4ccc-91cb-97c4c3839b1a/unity_editor_download_size.pdf
    • http://ralivapoked.epizy.com/36135509567.pdf
    • https://uploads.strikinglycdn.com/files/68d1d44e-9673-4892-8d80-211cb7a1979d/confidence_adjustable_treadmill_desk.pdf
    • https://uploads.strikinglycdn.com/files/1d209be7-269e-41a0-806d-75b26b66f854/instalacin_de_gas_natural_domiciliario.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_off000104a7.bin
0183376f51251bcf22bed9431ba12e1468c7f0611d8805aa027bf5d7cb64d11c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 5080 bytes
font_01_sfnt_off000115e2.bin
b12e9a7475bcc1e5b541d26e80f6378e4cbac122216948931022aa88f37ad0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 10992 bytes

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