Malicious PDF — malware analysis report

Static analysis result for SHA-256 0789f9bebd146917…

MALICIOUS

PDF

70.0 KB Created: 2021-03-08 22:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ddb8706d5941ed3a33cc605d1f2354f1 SHA-1: f6b2fa0813c6bc734710f84873d4bbab26eec8e9 SHA-256: 0789f9bebd146917a4d7ba7da1cc977323377eab0b652e2b366ce659222e2141
186 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 0.9998

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/123?utm_term=spelling+test+template+first+grade PDF link annotation
    • https://cdn.sqhk.co/divojimo/fghHjjM/82404235818.pdfIn PDF document text
    • http://urolog.xyz/tubotarolofisarh0wn0.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/gawanetaxetijo.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ZPzWVhd/zojanogumubuwexedezumiza.pdfIn PDF document text
    • http://ig-mediateam.net/10255040336offq7.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/600fb799011f6.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/fhiCGig/real_racing_3_pc_requirements.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/b39243.pdfIn PDF document text
    • http://zapixexarepol.medianewsonline.com/sims_3_patch_notes_funny.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/gumolafifowam.pdfIn PDF document text
    • http://bluebadgeform.com/west_coast_power_run_playbook_madden_21wvtol.pdfIn PDF document text
    • https://jukaregexiw.weebly.com/uploads/1/3/2/8/132816195/sixado-lajajofog-suzediwu-setoxazak.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/gefazijuri_dapibula.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/static_electricity_coulombs_law_worksheet_answers.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/why_does_my_thermostat_say_error.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/hj2EKia/vedewojezakunix.pdfIn PDF document text
    • http://good-production20.site/19951248491xbj8e.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/vibevadolukijifiku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezefaxovojole.atwebpages.com/88227355523.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_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 5464 bytes
SHA-256: b07eb1c7b4a908c74d73bb2ffea215cb4f2faf1deb80b9c68db80660b7325e83
font_01_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 10908 bytes
SHA-256: f7db9533d285026f93e8be4068f7f3bd8cc1db7f19e25bcc734353bc0158d852

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