Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d42bdfc92c81b2e…

MALICIOUS

PDF

73.8 KB Created: 2021-02-10 15:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 15a7e2b83ba153f0bb6dedae1ca3ad42 SHA-1: c6ff54294c5a75a5c42043fe9bca1c90687eff97 SHA-256: 3d42bdfc92c81b2e651d4f3bb9722aee41f2e28516906a492dfde7c5f4213c8b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious content or phishing sites. No scripts were extracted, but the presence of many external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://leonvi.ru/aws?utm_term=a.+d.+c.+a+full+form PDF link annotation
    • https://cdn.sqhk.co/nalujujoso/ahcIigt/hungry_dragon_richmond_menu.pdfIn PDF document text
    • http://streamsweets.com/56617485307hc8vg.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/BIjcjdC/kululoliwatujepawukewe.pdfIn PDF document text
    • http://insitemonitoring.com/descendants_skins_for_roblox_apkoqp04.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/journalizing_transactions_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/hiFhh0k/cute_cats_wallpaper_hd.pdfIn PDF document text
    • http://websecurer.tech/sezupotuzirog9o99n.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/doom_patrol_characters_rita0b6b6.pdfIn PDF document text
    • http://prechambre.xyz/84032490824imv0j.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/eJWBrQk/55524868025.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/dexjbij/whatsapp_app_download_for_pc.pdfIn PDF document text
    • http://figironeme.22web.org/network_master_speed_test.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/ja5O5ge/32931505569.pdfIn PDF document text
    • http://cafechorsu.ru/libros_sobre_el_cerebrolgn6e.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/fhihRgg/gadojitumuletojeka.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/fJAhija/zozogaramirop.pdfIn PDF document text
    • http://mangalvpodarok.ru/77250924346dh93g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jutibigata.epizy.com/45313012348.pdfIn PDF document text
    • http://jixepewix.epizy.com/43831601359.pdfIn PDF document text
    • http://bumazuk.rf.gd/magic_call_application.pdfIn PDF document text
    • http://gedanenek.epizy.com/cartoon_photo_effect.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/vopiwuzosinubuvarage.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 4540 bytes
SHA-256: a7d64b0d179e01e33dbf069c4091e8920fb752b6647d8e679508f572ba85d47f
font_01_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 10124 bytes
SHA-256: 25105e8d026eb7749a51e2c286c0c9516661a98b8661c92371e1d075732d3df8
font_02_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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