Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6fe309c235a152…

MALICIOUS

PDF

71.9 KB Created: 2021-03-14 15:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 52d3cb32fbfebbe582027a2b3b042d57 SHA-1: d0518211c60ff319b94e2833c319c8e3d71cef16 SHA-256: 0d6fe309c235a152af35b74857dea660a55d38d7f4a18cebd88978dca71debf1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm. The primary malicious URL identified is https://dugedepap.ru/strik?utm_term=how+to+enlarge+by+scale+factor+0.5, which is strongly indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

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://dugedepap.ru/strik?utm_term=how+to+enlarge+by+scale+factor+0.5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5ff4570b7bbb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_60119919194cd.pdfIn PDF document text
    • http://mifukuvij.iblogger.org/political_science_class_11_notes_in_hindi_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/ghiajiv/video_downloader_app_for_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/dgjjcjc/26489905787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5ff9ec3b1c36f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5ff8727dcda2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_6037d2e35b9f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fd6ab4667bd6.pdfIn PDF document text
    • https://cdn.sqhk.co/fakameratexe/Ngijcji/canada_food_guide_portion_plate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_6049ae073e652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_084a4c046a96465ea9fbf265f3d00035.pdf?index=trueIn PDF document text
    • http://jovifididapop.epizy.com/82049595695.pdfIn PDF document text
    • http://pimifemegizak.epizy.com/after_effects_cs6_getintopc.pdfIn PDF document text
    • http://pigotomuxezuko.epizy.com/what_is_systems_thinking_in_leadership.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_9f772c9786b64053ab9cff24dfce351b.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_3f02cf1b4b384628b0efd5d08c6caa34.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_998e436613ab49c39b0371d267da5c19.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_2b8ef424777c4ad7b4c7521db9dbb827.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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 5640 bytes
SHA-256: 04d4e280ad9abf8d6e9c0f11b781a8c1bf760e14354e44576ee258f5f569109c
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 10784 bytes
SHA-256: 3ae840a8247f181c173d1222d14d1215c42005a83801fe0d53cbd83530a85515

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