Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8a17262c62c0d5…

MALICIOUS

PDF

76.6 KB Created: 2021-05-05 21:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1234d74c86b91c24c856054e1e9f1b9f SHA-1: 98931c675e8c8340e7fe144945e9b4f564072f9e SHA-256: 7c8a17262c62c0d5ed5dec1be5dca8c5b6b11b79f11a132e1c6b72c3a7077825
126 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, embedding numerous external links disguised with seemingly innocuous text. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=what+are+the+5+main+books+in+the+old+testament
    • http://vobalemujumojak.mywebcommunity.org/bowobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_4a102faf8c244bafa6457df3f72fe86c.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_5742f83eab1b470b9316ec12eac413d4.pdf?index=true
    • http://piwolimosopobu.myartsonline.com/does_jared_do_ring_resizing.pdf
    • https://uploads.strikinglycdn.com/files/57455569-81d2-4e26-a5dc-459d5f68b462/how_do_i_clean_my_levoit_humidifier.pdf
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_ce6c5098c35b4cff82424280e2bb518f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38a95995-896f-4529-8c2b-bce71c87ef6a/tirifolurijajarut.pdf
    • https://uploads.strikinglycdn.com/files/026ea718-3707-4bc8-8499-7262fc1442e5/swann_home_security_system_reviews.pdf
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_defa5c5c55ec4e5d93fa317ca36e6f88.pdf?index=true
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_b822d3d6b2c242d789543343b1628ca0.pdf?index=true
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_2db21655bbb14255bb6b3db2572aeeea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6afa7a76-1c03-4af3-8782-f211c8419b8a/58366605152.pdf
    • http://parorusoba.rf.gd/pixisabu.pdf
    • http://bigapenegig.atwebpages.com/32102167925.pdf
    • http://tosopipates.epizy.com/foxajafufuzokusivib.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_1d49f0159b8c47db8fd7f475e47190ce.pdf?index=true
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_3d79314c5c0f48f2b3bf89310789c205.pdf?index=true
    • http://polilofu.onlinewebshop.net/beckhoff_el1904.pdf
    • http://jujeludapivibiw.rf.gd/munotel.pdf
    • https://uploads.strikinglycdn.com/files/f4e89bac-3c35-46ec-bfec-09117f15da50/bagidisepubolilob.pdf
    • https://uploads.strikinglycdn.com/files/f565bed8-d20a-4630-b1ad-4960ed4d4bce/warriors_dont_cry_chapter_4-6_summary.pdf
    • https://cabae152-0d18-4cc7-9545-8711a89e332e.filesusr.com/ugd/607e04_b7e3594802104725a521c1c03d076229.pdf?index=true
    • http://gorulilul.rf.gd/3113511535.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_off0000ed07.bin
2dddc23c8794713e2a0aab9c35054d28ba1f4baf879d6386ef64b8bc1fd6981c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 5408 bytes
font_01_sfnt_off0000ff47.bin
b716a195c5ffb5b87ce614017eb0dc99cdaa0c5b544aebc7fabf25af28299e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 11068 bytes

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