Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0eadbc7e2183273…

MALICIOUS

PDF

73.6 KB Created: 2021-03-16 05:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d7078ee4d03c24c45673fa09f19b34 SHA-1: 6c06d806b39a8edd6003a621db03f6154ce41daa SHA-256: a0eadbc7e21832739993feeef6437b0880c380e8ec8efec821233671f18661ef
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=beauty+and+the+beast+piano+sheet+musescore
    • https://cdn.sqhk.co/kolazapikib/idhcLge/casual_clothes_color_matching_guide.pdf
    • http://busimaderule.mywebcommunity.org/64463953566.pdf
    • https://cdn.sqhk.co/mamevugixej/G7jiggc/wufem.pdf
    • https://cdn.sqhk.co/nuponoviva/jh1HbJF/norenonodarojipa.pdf
    • https://cdn.sqhk.co/sadinuko/ied3gi5/taruporot.pdf
    • https://cdn.sqhk.co/tefupudoma/Tjc1jhF/55943522217.pdf
    • https://cdn.sqhk.co/rasidepad/hebjjjf/leather_jacket_mens_biker.pdf
    • https://cdn.sqhk.co/duzefodaf/6juxZxY/zeniziluje.pdf
    • https://cdn.sqhk.co/segenapiza/ihbihZv/truck_simulator_usa_hack_apk_ios.pdf
    • http://gubixazolela.sportsontheweb.net/98995038359.pdf
    • http://piwofoterif.sportsontheweb.net/72021374268.pdf
    • http://poxumanavofeboz.scienceontheweb.net/walarokex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vizepojuduw.rf.gd/melee_weapon_guide_osrs.pdf
    • http://mopezuvo.epizy.com/adobe_premiere_pro_templates_free_slideshow.pdf
    • http://jaxifepuxebadin.epizy.com/what_is_the_universal_feature_of_adolescent_development_brainly.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_ac554fccca8e429399ca1d8bdf54ee46.pdf?index=true
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_f84c6e97c8e34d2f8c94fe1fc987b77a.pdf?index=true
    • http://bogutofiwib.rf.gd/fufevojumutuzure.pdf
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_cf72d94e1f05441fa9ddc10cb35e6c59.pdf?index=true
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_433223f34e8b47f9a0d0ed5f565621e2.pdf?index=true
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_7068570546f044dba0261db86f90ebb5.pdf?index=true
    • http://jezeladi.rf.gd/vcenter_6._0_trial.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_off0000df6d.bin
258806c9e44ed395ff50d34939cb68acf51290fc020a753c09d52cd54b864358		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 5572 bytes
font_01_sfnt_off0000f239.bin
9b038316b44f7867bf7fa91fc9fb110660f04d7e83872cc4c146fc27745e9e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 11480 bytes

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