Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f460a5e73f1f91…

MALICIOUS

PDF

85.3 KB Created: 2021-04-04 05:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45b86b75f091a02a451c3c9968a8fa48 SHA-1: 514049c15e423ac89d4c816233892d05b678ff8f SHA-256: 62f460a5e73f1f91b4775b0876ae6a4f77cade3ac73eabdc3cbb79fffab1ed51
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to manipulate search engine results or phish users. The document contains numerous external links, with a primary suspicious URL being https://resalured.ru/123?utm_term=dermatopathic+lymphadenitis+case+report. While no scripts were extracted, the PDF structure and heuristic firings strongly suggest malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=dermatopathic+lymphadenitis+case+report
    • https://cdn-cms.f-static.net/uploads/4466662/normal_60112a6d0c17f.pdf
    • https://cdn-cms.f-static.net/uploads/4418180/normal_601a0a0c91e30.pdf
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fd9208f0f889.pdf
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/muvotifixobabotaw.pdf
    • https://cdn.sqhk.co/tetolonul/hcthijg/dragon_ball_fighterz_story_mode_guide.pdf
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/e8431ec16.pdf
    • https://cdn.sqhk.co/kerutadit/hiH9Fgj/jaxepunanad.pdf
    • https://cdn-cms.f-static.net/uploads/4369331/normal_602a04b9dc3b3.pdf
    • https://cdn-cms.f-static.net/uploads/4365612/normal_605bf3a03e30d.pdf
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/1364852.pdf
    • https://cdn-cms.f-static.net/uploads/4390052/normal_601fab74a5b1b.pdf
    • https://cdn-cms.f-static.net/uploads/4393179/normal_6036dfaf6ba5f.pdf
    • https://cdn-cms.f-static.net/uploads/4497372/normal_60315b5190957.pdf
    • https://cdn.sqhk.co/fegojujor/Lhajixw/summoners_war_promo_codes.pdf
    • https://cdn.sqhk.co/bupusudiva/aNskidK/bolejup.pdf
    • https://widalafamibag.weebly.com/uploads/1/3/0/8/130814492/7120324.pdf
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/5e174ca.pdf
    • http://tofotibuwul.sportsontheweb.net/xesiderebapavavimufifox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_8470e87e42ba43abb458f330c271408c.pdf?index=true
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_f2fb033a55b0413da0ee3e655c379e0a.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_63639bd60ba6435292242fc58fc6b902.pdf?index=true
    • http://tosipasakuvil.myartsonline.com/do_first_alert_fire_extinguishers_expire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff32.bin
24696d11e0df1bb905558a5b0a86a389cf987b4cf8675c6a48d58daaf3d89aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 5204 bytes
font_01_sfnt_off000110bb.bin
ca41b68e43fc24d275292d224d4ffbb112fac0ff50dcf7107385392ee7c31baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 12296 bytes
font_02_sfnt_off0001397c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 4324 bytes

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