Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf50cdd98268ad9…

MALICIOUS

PDF

72.5 KB Created: 2021-03-05 00:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c88bb6ad7c0cb843606638db696114a SHA-1: 0bdb5376d2bbd9bb54993bc9261e6ab0fd837818 SHA-256: 7bf50cdd98268ad9cbfaa703d0133b40e49941ed0474d7b708e170408bf82c0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=substr+in+sas+with+example PDF link annotation
    • http://rolapisi.scienceontheweb.net/31114153531.pdfIn PDF document text
    • http://watertea.space/85179929794j5qio.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/21502141895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379362/normal_5ff5d208b3762.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/604663588128w3wg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_6026f5f7795a3.pdfIn PDF document text
    • http://sportplays.ru/bar_training_course_2021s7n81.pdfIn PDF document text
    • http://songkfrk.site/hambriento_nach_descargarxf1wx.pdfIn PDF document text
    • http://insuranceautousa.com/how_do_i_reset_my_doro_70508r7uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6009b173c010e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468534/normal_5fc59fa3ecab4.pdfIn PDF document text
    • http://localdesign.me/womawibapojotoxdqfzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_5fd8155706431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_603ba3851aac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_6037497038f2f.pdfIn PDF document text
    • http://edayafar.xyz/definition_of_information_by_oxford_dictionarynesu5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5fcd0e3e96150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/how_to_use_chefs_choice_knife_sharpener_100.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_61f5a8d837fd40cc86c7c5950146e248.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_f79b707c2bc24c7a89f2be563dfde6e3.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_c868fc7415134fc9939d202c16dc595b.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 5464 bytes
SHA-256: 42cc16d9489d4fb62b9b1974216d19b47173053d56c0099bca2bc3d47c3d5604
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10776 bytes
SHA-256: 771a2b46f0bb4cd4cd2c4541472e077859fe02900bcf109720cbb8a786ae8f52

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