Malicious PDF — malware analysis report

Static analysis result for SHA-256 55645f5bbbe4f6d2…

MALICIOUS

PDF

73.4 KB Created: 2021-05-15 18:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f6ef33b690cc4f852915abf13f701d1 SHA-1: d277416b65e189ca1403d0cd87d56a7682340785 SHA-256: 55645f5bbbe4f6d2802f88f3ff9014da1cd6a46c2dcd734142e74a7438c8ce7e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common tactic for SEO link farms and phishing sites. The embedded URL and the heuristic firings strongly suggest that this document is designed to redirect users to malicious websites. The ML classifier and ClamAV detection further support its malicious nature, indicating it is likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=how+do+you+change+the+bulbs+in+an+edenpure+heater
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/bonoxale.pdf
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/20170a207c013e.pdf
    • https://jamisovuropasag.weebly.com/uploads/1/3/4/3/134396730/tudafol.pdf
    • https://kexiberuvulom.weebly.com/uploads/1/3/1/4/131409574/popirujojage_budanoxat_nubijaxa.pdf
    • http://vedice.ru/fundamentals_of_technology_project_management_2nd_editionadcnk.pdf
    • http://construt.site/medatopewarutepanulanzp8uc.pdf
    • https://tazapupexon.weebly.com/uploads/1/3/4/6/134634001/vodixupu.pdf
    • https://rupovopijono.weebly.com/uploads/1/3/4/8/134863796/zebuwevamidituzamaka.pdf
    • http://tokepubex.getenjoyment.net/xemunigukezatilijaf.pdf
    • http://lg-copyrightforms.com/converting_customary_units_worksheetc5oku.pdf
    • https://vimarunuwib.weebly.com/uploads/1/3/4/3/134356039/1023029.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fekazudabo/wagisaxixe.pdf
    • https://s3.amazonaws.com/sojenozap/kolew.pdf
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_99897ddc11e04d9cbde216638217c08d.pdf?index=true
    • http://vigexosav.myartsonline.com/45921871473.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_bc4fea241fc5467a848843c6b053d7a6.pdf?index=true
    • http://tulifal.onlinewebshop.net/nusedaxokapakuramu.pdf
    • https://fea50346-ab34-4b67-843e-90a6383c4983.filesusr.com/ugd/bf678e_775b8a9301b042378f662f336398b37b.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_off0000e242.bin
b3420657d3e3c6655fa713fadcf65a7c2542805800417227d7e9ceeda3278fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 5632 bytes
font_01_sfnt_off0000f56c.bin
db58d9fabb0e9d9da8932dea39ca4da21d7e2fdc7d1d29b6683b8c42a0662ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10116 bytes

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