Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09b77c7cad525bd…

MALICIOUS

PDF

77.4 KB Created: 2021-03-28 05:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f3a8038b8b4c3044d3814e7019c5b1f SHA-1: ddc32298bd8d4399a423b8cc202de4e059f64819 SHA-256: a09b77c7cad525bdb3713449c2e9844c570350c3b8e35ebcfc9c8d196023bd50
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-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://jumiwimov.ru/strik?utm_term=how+to+properly+adjust+a+hvlp+spray+gun
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/livuxidemokor-nusenabilamajuj-zivez-rajaxusu.pdf
    • https://kelulove.weebly.com/uploads/1/3/0/7/130775366/2380fa80336f.pdf
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/sebovuwowosadoli.pdf
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/d8fdc47e90e8.pdf
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/vularekak.pdf
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/gikodeniz.pdf
    • https://bibeluwevolaru.weebly.com/uploads/1/3/4/4/134497964/5050011.pdf
    • https://vuguzazevuzuk.weebly.com/uploads/1/3/5/3/135316601/tunesovodufulepifex.pdf
    • http://tubuxudaxuj.iblogger.org/dalewab.pdf
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/sekot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nipuwiwabo.rf.gd/fimawi.pdf
    • http://sarozaxag.epizy.com/4375175941.pdf
    • http://pulijivugis.epizy.com/lorud.pdf
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_a9704f1591174461b5bc6694cea6cb16.pdf?index=true
    • http://nexebudavosev.epizy.com/flexible_budget_performance_report_example.pdf
    • http://xepesufotereri.rf.gd/vufokogafater.pdf
    • https://uploads.strikinglycdn.com/files/b260a534-eb92-41c5-9e30-2c8f8d7dfec9/cobra_200_gtl_dx_review.pdf
    • https://uploads.strikinglycdn.com/files/fc43a19e-c0dc-4ff6-8625-8b3063b6c2d2/stargate_rpg_wyvern.pdf
    • https://uploads.strikinglycdn.com/files/44eafd9a-8092-4b2c-b6f8-feb5fcc7e0e9/integration_of_cos_x_1x2.pdf
    • https://uploads.strikinglycdn.com/files/e6c29d62-fde4-478f-8078-8ad235abfe56/scary_stories_to_tell_in_the_dark_2019_trailer.pdf
    • https://uploads.strikinglycdn.com/files/4dd93e42-5351-4375-acd9-f90e26620034/98354658776.pdf
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_69135068afd544118cbb2716c0168594.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_off0000ef72.bin
7f95cd3b3b74e961cbef09386ffee4f42d94f7ca0af611bc8c162e300955c197		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 5512 bytes
font_01_sfnt_off0001024d.bin
42cc316012586298963a3485ea8b12b714bbff994528931d3d18f2ee6b517e66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10980 bytes

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