Malicious PDF — malware analysis report

Static analysis result for SHA-256 0813de8707b37663…

MALICIOUS

PDF

71.1 KB Created: 2021-03-11 12:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42825f31510625e32f2fc05ce7d04b2b SHA-1: d03fa9de8602ff12c49f8436945678d04d9eadbe SHA-256: 0813de8707b376638254b27920f7a63906fefd2481ba8a0d2ae2d9742588615c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic to manipulate search engine results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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/aws?utm_term=is+sophie%2527s+choice+on+netflix+uk
    • http://boxberry-24.cc/tezitqekbj.pdf
    • http://test123test.xyz/tos_kurim_fnk_25_manualx9r4m.pdf
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/5082325.pdf
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/00b39e.pdf
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/kudakonem_repusovikobeda_zotetuj.pdf
    • https://jeluvuxibobuna.weebly.com/uploads/1/3/4/0/134017570/limer.pdf
    • http://select-get.top/probability_questions_and_answers_grade_8oy9hc.pdf
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/3600078.pdf
    • http://sun-italy.space/41164230071zeck2.pdf
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/nupafolijafip.pdf
    • http://itdomen.fun/cyberark_pta_installation_guideva8ku.pdf
    • https://boruwimuruliv.weebly.com/uploads/1/3/4/8/134875556/rasolezefotaxozim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lejivugeleguwod/23339067279.pdf
    • http://mesujexu.rf.gd/88759615474.pdf
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_f1547354bc9f4b45875ec28e1b6b18ac.pdf?index=true
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_e4279e335d8e4dcc800a48ef20e00343.pdf?index=true
    • https://s3.amazonaws.com/tonisefoteka/verovof.pdf
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_81dfae3799f3466b87e359c088e5f187.pdf?index=true
    • https://s3.amazonaws.com/xasovewipeje/capacitance_physics_lab_report.pdf
    • http://lipunigofajeza.epizy.com/53485674471.pdf
    • https://s3.amazonaws.com/jenagubadopi/n64_emulator_android_multiplayer_bluetooth.pdf
    • http://fumojaw.epizy.com/cholesterol_guidelines_made_simple.pdf
    • http://lofawevivere.epizy.com/46172663590.pdf
    • http://boxokur.epizy.com/31565853008.pdf
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_9c5216e76d874c72ac2437b1701ce691.pdf?index=true
    • 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_off0000daf2.bin
73a9720d02aefe45f78bb95bd4b367899e14332e9b3002a9dafcffb0267e5d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 4900 bytes
font_01_sfnt_off0000ebb3.bin
6edd75567cd23cba436a57962857237bcf14d486f0c501a55c8535a393064705		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 10172 bytes

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