Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cde04887a86faa…

MALICIOUS

PDF

124.6 KB Created: 2021-03-21 23:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f9db49959ba003147aaab68c9cfa6a99 SHA-1: 4e8aaba91a02c4c69fca134df3ad0ead4680136c SHA-256: 34cde04887a86faaeae050155f5c211d0288684dcc7d1706680f89d886e966f9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with several pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded document body text is heavily obfuscated and appears to be a lure related to search engine optimization or academic topics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/wix?keyword=what+is+a+factorial+anova+test+used+for PDF link annotation
    • http://pumba.fun/32396499389cysdm.pdfIn PDF document text
    • http://copyright-help-report.com/2014_ford_explorer_workshop_manuals6n1l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd6c24b113c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5fd384e758ef6.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/xukesubegatexemabikamara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fd31f4dd935f.pdfIn PDF document text
    • http://lavkavkusa.store/xepewinarenalmpsjy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459028/normal_600ebce545822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5ff27d4ef332d.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/community_ecology_download.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/34766270758.pdfIn PDF document text
    • http://contact-git.top/vulivibojoputaca90z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_602b8946d46c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_60292d4264f0a.pdfIn PDF document text
    • http://xutusurekawidi.medianewsonline.com/seven_wonders_of_the_world_file.pdfIn PDF document text
    • http://vkysnaya-eda.site/arsenal_vs_liverpool_highlights_video8op1n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_601a2e4c911eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fe51087af0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_6040522029b4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_4d27fc96a26146c5bf947e13cdac388c.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_6958eb6ef6db42119a0cd114d0d13473.pdf?index=trueIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/bhagavad_geeta_in_marathi_free_download.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/65560201815.pdfIn PDF document text
    • http://bokepomi.onlinewebshop.net/41173402916.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_fa9689dae0ca47c0be0463bfeffe36ad.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_1b43e232a6ba46f093668be1b1f3a088.pdf?index=trueIn PDF document text
    • http://niselekotoz.myartsonline.com/mujep.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A99A 5180 bytes
SHA-256: b5b65a57a210038994687858248742c69f7f5b5cdc88f47cc360ca1a0dae240d
font_01_sfnt_off0001bb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB45 11884 bytes
SHA-256: 30b670357ad00795559a4a080042900739b8c61d634a06e545e1cee15c3b6d1c

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