Malicious PDF — malware analysis report

Static analysis result for SHA-256 4173eadddd2a858c…

MALICIOUS

PDF

84.0 KB Created: 2021-04-22 03:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5575b7152401b0473acdd5d02baf4416 SHA-1: 595a9309d8275a5476631e4f8930e899b0e3c8e2 SHA-256: 4173eadddd2a858c1f6de3d4eb12da97687d3e453f46d0cf59302029159482a3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://fokemale.ru/strik?utm_term=experimentos+con+animales+y+humanos PDF link annotation
    • https://cdn.sqhk.co/fekoguwiwu/iharvjf/jevejatiguta.pdfIn PDF document text
    • http://pidijajuwupurop.medianewsonline.com/nadozu.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/jaidbau/wwe_extreme_rules_live_results_bleacher_report.pdfIn PDF document text
    • https://gizisojanixagep.weebly.com/uploads/1/3/4/4/134495782/norisuni_xemomak_devepikito.pdfIn PDF document text
    • https://cdn.sqhk.co/pujimuxuja/e7hetgh/zebavisifolarigidosi.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/oWjbujc/history_of_cuban_link_chain.pdfIn PDF document text
    • https://fuxuvaxekanu.weebly.com/uploads/1/3/4/6/134648937/c2a80b.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/free_printable_blank_bingo_cards_for_teachers.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/90388844728.pdfIn PDF document text
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/675772.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/budak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/gali_chirugali_dj_naa_song.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/wopemim.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/lozagulabebugofivasu.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/how_to_cook_a_perfect_turkey_in_a_roaster.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/tecsun_pl-660_bedienungsanleitung_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/8133912301.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/facebook.com_desktop_messenger.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/70231484143.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/osrs_hidey_holes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/54449356069.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_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 5300 bytes
SHA-256: a76e6b93ad9deb4a0bc461a68463e646b95e232004e450d14f305fb51f6e1dc4
font_01_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 12088 bytes
SHA-256: c712285734d9c6853256acc86d7c6e21477f696abfe0072da0fbff0e2a9e495e

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