Malicious PDF — malware analysis report

Static analysis result for SHA-256 6640928343e92cbc…

MALICIOUS

PDF

73.0 KB Created: 2021-05-05 13:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 842491a94ee6bf07ad4940b57a7c5118 SHA-1: b5adc6aae976f270827b5586b81672d48a2471e5 SHA-256: 6640928343e92cbc0408faf708f279fd3c20b767ca57441000d48a571a8862e2
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with phishing or malware distribution. The PDF structure and embedded links suggest it is designed to redirect users to potentially harmful external sites, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+to+buy+an+adjustable+bed+frame
    • https://cdn.sqhk.co/zezegawutogu/jcyiiiF/30746772070.pdf
    • http://flymoney.net/does_duke_require_sat_subject_testsumr7v.pdf
    • http://kulokozataxat.22web.org/programming_in_computer_science_courses_northwestern.pdf
    • http://unosital.space/badamuvefovusujovoduxaweblo17t.pdf
    • https://cdn.sqhk.co/jomonufo/gZhfelQ/61007116087.pdf
    • http://dukegexixek.iblogger.org/wajaka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jafepotafeno.epizy.com/purble_place_gratis_windows_10.pdf
    • http://puderumito.rf.gd/97121812218.pdf
    • http://xekurenu.rf.gd/98308889648.pdf
    • http://vofoxefubi.epizy.com/gulimazadok.pdf
    • http://gubilozav.epizy.com/ailing_planet.pdf
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_21225c1adebe48ce96fc0edb489b9afa.pdf?index=true
    • http://tavubemafixa.rf.gd/41135749690.pdf
    • http://fobexegedun.epizy.com/lawiwopogerobaxusukekime.pdf
    • http://vuxekote.rf.gd/pavuzafalex.pdf
    • http://gevowurarabaj.rf.gd/schwinn_bicycle_odometer_instructions.pdf
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_8446d300a26d4e83a4aa0a5bdc865180.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_off0000de99.bin
8db64a9c19e68a92c6f1e68dfdb49eed0e8eabb35ecfbb3d573daec0709e0d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 5424 bytes
font_01_sfnt_off0000f109.bin
f880148addcc4db766729f93a736155451b44533134dfdd7fa12c683124e91c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 10632 bytes

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