Malicious PDF — malware analysis report

Static analysis result for SHA-256 1556c6aece651927…

MALICIOUS

PDF

74.2 KB Created: 2021-02-18 18:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd924c027591cc86f2750185307340eb SHA-1: 2a3bd14608fd163028d19cf3b5271aa4557e117f SHA-256: 1556c6aece6519272911f5db18a57558db282055e6a376e5e6b595c022f2de09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=spanish+vocabulary+list PDF link annotation
    • https://torofijode.weebly.com/uploads/1/3/5/9/135978969/1592715.pdfIn PDF document text
    • https://lirujisigibat.weebly.com/uploads/1/3/0/8/130874608/6ab6a70667.pdfIn PDF document text
    • http://ruvagusowi.22web.org/free_classic_arcade_games_for_android.pdfIn PDF document text
    • http://wei-nmvc.com/crystal_reports_sapxmlh7.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/hjdgdca/online_business_startup_checklist.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/party_invitations_templates_printablegsgzn.pdfIn PDF document text
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/fa19833fba9e61.pdfIn PDF document text
    • https://budovatepita.weebly.com/uploads/1/3/1/3/131398204/vaped.pdfIn PDF document text
    • http://pobegikobej.iblogger.org/bum_chiki_bum_bum_song_video.pdfIn PDF document text
    • https://cdn.sqhk.co/zunowexafa/Wgghdic/lurelu.pdfIn PDF document text
    • http://experiment.website/facebook_marketplace_local_cars_trucksdttcm.pdfIn PDF document text
    • http://clyb-wylcan3.space/pataxolulekibevolcszpo.pdfIn PDF document text
    • http://mishabelle.ru/18660250380dwprg.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/EyibPmG/53085051562.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/IihOje7/nuzokeroxotepusuj.pdfIn PDF document text
    • http://getplafond.xyz/bumunifewufi8tn7j.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/71963314214vdium.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevilapipox.rf.gd/viforagevevixafuvi.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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 5428 bytes
SHA-256: 739323d43329cbc01f0b6e53ac8adc4948e307c396391ee91d37bcba8b0f4257
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 11856 bytes
SHA-256: 41546fb67eeb99eff0d77e1ff70b12f795252bae66d0686bad73ba8529084b57