Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7ae31d2e872d48…

MALICIOUS

PDF

88.4 KB Created: 2021-04-01 06:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba1072e84cdcedaf921e96f8e9e2af83 SHA-1: 65b37427d93e222320327d830015f11be09ab25f SHA-256: bf7ae31d2e872d484c2d7e85aaeb382eeffa5a244441b8548362646d3149cdcb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests an attempt to redirect users to potentially harmful content.

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://kuzutuzo.ru/strik?utm_term=denon+avr-591+5.1
    • http://xusibuvuzos.22web.org/namukifizekimaxu.pdf
    • http://buvosidif.22web.org/schaum_outline_series_group_theory.pdf
    • http://fojukivijivik.medianewsonline.com/strategic_management_fred_david_17th_edition_free.pdf
    • http://neridofufuleteg.scienceontheweb.net/mutijamugelegilibibez.pdf
    • http://tubesebove.medianewsonline.com/32691677550.pdf
    • https://magirodimape.weebly.com/uploads/1/3/1/6/131637482/tipunobukizo.pdf
    • http://maroron.22web.org/samsung_galaxy_bypass_google_account_apk.pdf
    • https://monogelifanalo.weebly.com/uploads/1/3/5/3/135387447/tagizuripoki.pdf
    • http://idealica-ordina.site/levewibobatujubepolutilkkpup.pdf
    • https://setanalad.weebly.com/uploads/1/3/0/7/130775470/sujipadibe.pdf
    • http://girlsbeach.space/razisirisakunozujevebj8j3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/00336be2-9237-4df3-8fb5-4fb01dffee90/kerofa.pdf
    • https://uploads.strikinglycdn.com/files/a47cb95b-dcac-4d14-8ab8-ce8e336e8588/scosche_loc2slsd_wiring.pdf
    • https://uploads.strikinglycdn.com/files/b885ee3f-9f1e-45e0-923e-3f46ba5b7539/wabokiweko.pdf
    • http://zumewozuzetarun.epizy.com/gnomeregan_tank_guide.pdf
    • http://molomafifivis.epizy.com/el_alquimista_en_ingles.pdf
    • https://uploads.strikinglycdn.com/files/e758cf00-2bcb-4cdb-9609-1c5a09f3a28f/tri_tronics_classic_70_g2_transmitter_battery.pdf
    • https://uploads.strikinglycdn.com/files/f436c3af-8252-48b7-9023-0cb40f060ef4/la_ciudad_de_las_bestias_capitulo_12.pdf
    • https://uploads.strikinglycdn.com/files/58c073d5-1f7f-439e-8ad7-e790dcf35276/14869862859.pdf
    • https://uploads.strikinglycdn.com/files/4fc9136d-3896-4dc8-8079-4cb421a292ce/wowiri.pdf
    • 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_off00011af9.bin
8b6803d35228d526726c89a3f8828bdeaa2f1941d4e0339d834deac7b8285de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 4924 bytes
font_01_sfnt_off00012bec.bin
ee4f89258e6201362d6d7bd5abe5931631cdbd9e28b43ada3fd9a8625b200810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 11612 bytes

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