Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe722b37e6332ee…

MALICIOUS

PDF

93.4 KB Created: 2021-03-10 13:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 18420a03b5a3dd8c780bf3119ce358ce SHA-1: 369c840b5efe7c7d3aaf953c5229be7b566bdc1a SHA-256: 8fe722b37e6332eeadbd9151d31b878c4706d5aa8e129c2086d8bda91e7d3309
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 0.9992

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://xezojetit.ru/wix?keyword=sapling+learning+answer+key+macroeconomics PDF link annotation
    • http://mishabelle.ru/la_charade_des_animaux8oqj2.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/0iNkgdK/6962641133.pdfIn PDF document text
    • http://ewop.space/delivery_at_pace_competency_example_answersth5i9.pdfIn PDF document text
    • http://lamovingcompany.com/51191943665nxleg.pdfIn PDF document text
    • http://kieverts.xyz/diary_of_a_wimpy_kid_deep_end_online_bookvplaa.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/IieprUn/roxuxaseduzil.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/hghijHA/66978785642.pdfIn PDF document text
    • http://pressit.space/how_do_i_unclog_my_washing_machine_drain9dx04.pdfIn PDF document text
    • http://kpupnov.pro/zapudevexebapobokojewxlgv5.pdfIn PDF document text
    • https://gidujufopotadav.weebly.com/uploads/1/3/0/9/130969470/riluko_rodipunebuk_tapiz_nafikatetitut.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/98ad9898af.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/fqn9oij/lafetusokipolakilisowop.pdfIn PDF document text
    • http://winoraama.site/55324602044b9c5c.pdfIn PDF document text
    • https://negamevetafe.weebly.com/uploads/1/3/4/4/134439480/papapupigujivu.pdfIn PDF document text
    • http://donbetosstreettacos.com/which_app_is_best_for_reading_books_for_free29b4l.pdfIn PDF document text
    • http://arnautmebel.ru/bim_360_designasryr.pdfIn PDF document text
    • https://wujatukeki.weebly.com/uploads/1/3/1/8/131856991/navef.pdfIn PDF document text
    • http://leadtop.co/780597212429i606.pdfIn PDF document text
    • https://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/9722495.pdfIn PDF document text
    • https://baxorumele.weebly.com/uploads/1/3/0/9/130969728/cf51f12159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_f5a3def224fb4839a7eb0bcf91736de0.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_8a690c4e8aa645bdaaaa42cc696aca11.pdf?index=trueIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_3c95ac985cae4b6591c2b1bdd0da2bb7.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_087c4c858db74afe86984c62e36d47b6.pdf?index=trueIn 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_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 5612 bytes
SHA-256: cc748f293462c5cfe5ce401efb5ff971296608c4b2a38f181c0681889834e43f
font_01_sfnt_off000143b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B3 10640 bytes
SHA-256: be594f94f7f89abffb9d5cf69ba80fc935c3096add02523118ad51773a981483