Malicious PDF — malware analysis report

Static analysis result for SHA-256 11de9aea897e77b0…

MALICIOUS

PDF

73.5 KB Created: 2021-03-30 00:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 574a2c7d1e49dfc143edec64c5e43d34 SHA-1: 50ace6b5baefa4b357a8216112239bb1f6beafd5 SHA-256: 11de9aea897e77b0a28dc2e2c8af7292e02fa36bef8e9de604ec768d2d8c7a46
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a spearphishing attachment attack 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 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://lozipotod.ru/award?keyword=platform+business+model+pdf PDF link annotation
    • https://pokukumujipuk.weebly.com/uploads/1/3/1/8/131856200/vikozozakozi-lameniwonutaka-nigiwinijenu.pdfIn PDF document text
    • http://myfirstsite.xyz/grammar_school_test_papers_with_answers1p9pk.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/5316572.pdfIn PDF document text
    • https://gokejubekilebu.weebly.com/uploads/1/3/4/3/134376129/265367.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/manual_de_organizacion_del_consejo_tecnico_escolar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372361/normal_5fc63c13bcfa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_60059f2d76ea9.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/44190272014.pdfIn PDF document text
    • https://moliveje.weebly.com/uploads/1/3/5/3/135323163/8a88c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60148f7a45474.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/4794211.pdfIn PDF document text
    • http://moreprodukti.com/pafukekopnzr5x.pdfIn PDF document text
    • http://insitemonitoring.com/versatile_solvent_importanceyrvnc.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/firujujozivikegowedanaviw.pdfIn PDF document text
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/4829244.pdfIn PDF document text
    • http://medtechnika1.ru/30652495953zyir4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nalifij/bevat.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/forrester_report_on_chatbots.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_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 5328 bytes
SHA-256: a9a3136178586b19bf0f9bba015a57a766bf670b3f5fac79979d86593ef39125
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 10240 bytes
SHA-256: ec58b9b302b7fe2465c264937e786681bd9bb7570bdeacd8cf3e330f4590d3dd

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