Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4db6980150aaa9…

MALICIOUS

PDF

81.9 KB Created: 2021-03-30 16:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39dc4daef87645f8ebe322923d561172 SHA-1: 744ac69dff5019d7ec19794bddf8faa3cdc85996 SHA-256: ab4db6980150aaa9d2e09d06f584da0fdec9d102b175fee47f663f5bf5ca175c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, such as the identified link farm, to achieve its objective.

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://dafemum.ru/wix?keyword=war+of+the+spark+card+price+guide
    • https://cdn.sqhk.co/fuguwaso/U2gdngg/kumupasedotutamixatefapo.pdf
    • https://cdn.sqhk.co/javeduner/dJjahga/callbreak_multiplayer_mod_apk_download.pdf
    • https://static.s123-cdn-static.com/uploads/4460241/normal_600324e7d3c73.pdf
    • https://fixaninupokawaw.weebly.com/uploads/1/3/0/8/130873986/873370.pdf
    • https://cdn.sqhk.co/piwuzuberaze/gSXjchj/mimpi_dreams_switch.pdf
    • https://cdn.sqhk.co/rotelizedo/gjKgiUC/lutisozilazimomamogisexo.pdf
    • https://muzaromiv.weebly.com/uploads/1/3/4/3/134380281/febasabijinap.pdf
    • https://cdn.sqhk.co/kupejabel/bhimjfh/how_to_make_farm_animals_out_of_paper.pdf
    • https://static.s123-cdn-static.com/uploads/4389101/normal_5fc82585df60c.pdf
    • https://cdn.sqhk.co/nivatasob/geqhhN2/20742197438.pdf
    • https://cdn.sqhk.co/mawejoxejobe/Dhfig3n/rawezutivagomof.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_60247ecc7a16c.pdf
    • https://cdn.sqhk.co/zidulibu/djaHihx/strategic_management_consulting_definition.pdf
    • https://cdn.sqhk.co/fapiwejagiz/aKeLb1i/run_rabbit_run_2017.pdf
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/suwidaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/perurulexi/pabivekomukorepalubo.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_648f1e76d46742d4a29c280f7473393e.pdf?index=true
    • https://s3.amazonaws.com/vuforewebub/cisco_ccna_security_study_guide.pdf
    • https://s3.amazonaws.com/mipeboro/53464562108.pdf
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_dc39dc269f7946de9b625775b25fb10d.pdf?index=true
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_f5e2181c251f4b8f9c8266e5e07f7b0c.pdf?index=true
    • https://s3.amazonaws.com/xeropizuwe/2666778116.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_off0001044e.bin
4a924c0027d6a1dce401dbbca41b8220e54345fdba3423a861d4228a46a59cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 5464 bytes
font_01_sfnt_off000116f0.bin
9569631163849cfb03fc0e020e167f3cacdb75f52afa51825ec7f2423e941a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 10272 bytes

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