Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ffffdbee98ca9e…

MALICIOUS

PDF

70.5 KB Created: 2021-01-24 12:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d4ae9713f7c223e876654936aa852519 SHA-1: 7fde417b79e138665a2bedd655281ea126aa5980 SHA-256: 31ffffdbee98ca9e3468d6271b73d963485e3d8f96f74e2a5cf9c5745dd3721b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, contains references to 'Hyperion pdf book' and authoring details, which are likely lures to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=hyperion+pdf+book PDF link annotation
    • https://cdn.sqhk.co/luxixumogez/JY6Kjj8/1931827120.pdfIn PDF document text
    • http://verification-help.business/773093539020yb0d.pdfIn PDF document text
    • http://how2clever.com/mulepapanifisuraziniguaiiwl.pdfIn PDF document text
    • http://oneitstore.info/stick_stunt_biker_game_downloadd9wnf.pdfIn PDF document text
    • http://qiwi-wallet.online/resident_evil_8_chris_redfield5k7cj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5fd0391e1b501.pdfIn PDF document text
    • http://mattelipsticks.site/inter_football_manager_2019_facepackxyn97.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/haLLrJb/new_ringtone_for_iphone_download.pdfIn PDF document text
    • http://pshcomonhere.xyz/46010143075eksvk.pdfIn PDF document text
    • http://akfb.online/retro_wallpaper_computer4cxov.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/hola_music_guitar_lessons353lc.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/NubC4hi/tujomapavodejugefum.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/nonipesikiri/awadhesh_premi_dono_indicator_song.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 4880 bytes
SHA-256: 66b5daff9b522d161c0a019849648df8341fe3f2b1ae4039475faef2f2d7b678
font_01_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10516 bytes
SHA-256: bee186912e30420fbb521b71cb1d65af1d5b45dd379fe596609660f661ec45e3

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