Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5052d564aba47b…

MALICIOUS

PDF

73.5 KB Created: 2021-04-01 03:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012b19c393d75cf943f2807190d02a55 SHA-1: 8880471d0ec08bd9efe9591c231e3e962f70de68 SHA-256: 8c5052d564aba47b560a12b1b0a1e6cb18f2a2872c625d02a829d1c5120a85ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cdn-cms.f-static.net/uploads/4426820/normal_600f91b5edfb3.pdf
    • https://cdn-cms.f-static.net/uploads/4380854/normal_603e3c95a1734.pdf
    • https://static.s123-cdn-static.com/uploads/4367656/normal_60051599ce783.pdf
    • http://katipef.medianewsonline.com/tedokelikife.pdf
    • https://fewifaki.weebly.com/uploads/1/3/4/5/134578400/digibe.pdf
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6010338ac4d34.pdf
    • https://cdn-cms.f-static.net/uploads/4401517/normal_60411d0551c93.pdf
    • https://bedasalisavif.weebly.com/uploads/1/3/4/6/134601990/808946.pdf
    • https://cdn-cms.f-static.net/uploads/4480155/normal_604870a484439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=bradley%20smoker%20recipes%20pork%20shoulder
    • https://s3.amazonaws.com/napoledunadigo/amazing_engine_rpg.pdf
    • http://liduvitulugug.onlinewebshop.net/tarizezavakif.pdf
    • https://uploads.strikinglycdn.com/files/0ce0ed38-c0f0-487d-bf1f-1690906f4ea6/radio_shack_multimeter_manual_22-218.pdf
    • https://s3.amazonaws.com/mujesogi/tupefabo.pdf
    • https://uploads.strikinglycdn.com/files/886182d0-e90f-487d-b1ca-ef68abf1a3e4/discrete_mathematics_and_its_applications_7th_edition_solutions_manual.pdf
    • https://s3.amazonaws.com/fejatepudopito/tonaxitef.pdf
    • https://uploads.strikinglycdn.com/files/bbbf1f71-3f19-4818-9dfb-b2e02afeaaf5/best_stock_symbols.pdf
    • https://uploads.strikinglycdn.com/files/34b0f2de-978e-4294-b50d-312e85cf278c/learn_c_in_one_day_and_learn_it_well_c_for_beginners.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e315.bin
16e38b59b594efe0fc5470761773441fc86ed20fa0ea646569561215381f884a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 5528 bytes
font_01_sfnt_off0000f5ba.bin
a263831f8676b3ddf88d8ddf6b48c51469b14f4dcb4433670c2b34882a6dd057		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 10272 bytes

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