Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6f0b8ee51cbe95…

MALICIOUS

PDF

73.4 KB Created: 2021-04-03 16:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3374fe1d9e2eb90d698dd64be127d09a SHA-1: 20d3906ce9e98f7d0de5793f2f9d2c0ea2318edf SHA-256: fc6f0b8ee51cbe951788ad125c6ec3bdd828d451a10379c0fcad80252a0ca227
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://lozipotod.ru/strik?utm_term=man+the+unknown+pdf PDF link annotation
    • http://fonareru.22web.org/4684210466.pdfIn PDF document text
    • https://rulovukefaz.weebly.com/uploads/1/3/4/7/134712077/nupenika-gakatuva-gazod-sejut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_605027366bde6.pdfIn PDF document text
    • https://govuxedosuwiwur.weebly.com/uploads/1/3/5/9/135962540/bf69374.pdfIn PDF document text
    • http://wajobok.iblogger.org/sky_movie_action_tv_guide.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/calidad_de_vida_en_mexico.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/dea2c023a7.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/rifuvujadosojodu.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/fbd089d3d7a.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/relieving_letter_format_from_employer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_604109d7b1f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_601a7ea55b045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudawugir.epizy.com/ashrae_handbook_fundamentals_1993.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/10565613335.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/pubitobitero.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/jalebi_game_answers_in_tamil_language.pdfIn PDF document text
    • http://bokapis.rf.gd/how_to_program_my_universal_remote_to_my_philips_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/zanisivolo.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/anniyan_movie_love_bgm.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 4984 bytes
SHA-256: cfc5dd00c35931a30710b5756cfc4c868afdf2e6ce416777e3af849118c6626f
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10576 bytes
SHA-256: 16f3350b52346b52ff2282816ecfdfb0774318abca7c47700b552aac8d59e726

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