Malicious PDF — malware analysis report

Static analysis result for SHA-256 916de1008ae9d71a…

MALICIOUS

PDF

77.4 KB Created: 2021-03-12 08:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aa469b71b6bc3409af7c4ab8c37ac889 SHA-1: 6a0981b471b4ed2eb83b4a32e9936cdaf909bd3a SHA-256: 916de1008ae9d71a44f8ca86ce5528e58efff6be22def7ffb7579e65b44bf867
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://bologen.ru/wix?keyword=pun+in+romeo+and+juliet+act+5 PDF link annotation
    • http://lidzadva.xyz/doctor_answering_service_jobs_from_homef9ili.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/dbjifie/geloluresatolusixe.pdfIn PDF document text
    • http://kulokozataxat.22web.org/pandorum_english_subtitles.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/H0hgect/call_break_multiplayer_card_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcff141b219a.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/Xhfijhj/worm._io_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_601319a551f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_6028948e3a93f.pdfIn PDF document text
    • http://xifotole.iblogger.org/41008670959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_601e514347968.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/lFjIjbn/jususijifarebimap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_602789f516636.pdfIn PDF document text
    • http://mazers.fun/that_will_be_fine_turn_into_negative_sentencenuf7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_5fd96542408a3.pdfIn PDF document text
    • http://zoneeuro.pro/wukuxirnejwn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_60031db78c5d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_06173d9f38984fe395e540281386e94a.pdf?index=trueIn PDF document text
    • http://safuzidavoje.rf.gd/7930413440.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_8b4a823bd5ee4004ba3b49725621efb7.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_acc3fdf31430415eb59987badc5b48b3.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_791aac708534483083594bf463bbd8d0.pdf?index=trueIn 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_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 5108 bytes
SHA-256: 545915b081ff2e402846df5a90214edff45c8efa4626a4061053a04224acaf16
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 10364 bytes
SHA-256: 52fd02a9e73026d47c5b02a33644ecc38638f254ce0cdfbbbd4d9225957538d8

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