Malicious PDF — malware analysis report

Static analysis result for SHA-256 b588c9c593addd41…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 09:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a29f9b0c13529ac322422a1db7bee3f SHA-1: d48d6e85ebaf226a64d9e3a5e4ebf3b04bd5d13c SHA-256: b588c9c593addd412715c27b74ec7232cc2b8e8d4b9b0d9d76f5c3588114f95d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://posicert.com/upload_fck/file/2021-9-6/20210906053517275018.pdf
    • https://hygradeinsulators.com/images/uploads/file/87736553223.pdf
    • https://manorhair.com/uploads/files/202108312323125788.pdf
    • http://goref.ru/files/file/72801146561.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/30574797279.pdf
    • https://gopherscopes.com/userfiles/file/17839477628.pdf
    • http://www.allatpatikapecs.hu/images/file/26962589811.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/38125096541.pdf
    • http://rollfactorytogo.com/uploads/files/25694558383.pdf
    • http://antichigelsi.it/userfiles/files/jijefevojavugisuzazuxapa.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2ab8defd---medabaxegapuminoxe.pdf
    • http://akvatoria.by/UserFiles/files/selaworezijisekajudilotax.pdf
    • http://aaz.sk/editor_uploads/files/nexakelof.pdf
    • https://albawadiroad.com/userfiles/files/gebomumigilobowi.pdf
    • https://latework.cz/soubory/14426820691.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/95833530525.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/vuxuzezosazagawexi.pdf
    • http://lineshare.net/upload/files/20210906155150.pdf
    • https://psychologgia.pl/Upload/file/detanabus.pdf
    • http://ambartakip.net/belgeler/file/zavafu.pdf
    • http://sanga.asia/userData/board/file/jimuvurejodoxo.pdf
    • http://yuhenganquan.com/userfiles/file/20210903075910_151175785.pdf
    • http://www.romanschatztruhe.de/img/files/88848466112.pdf
    • http://yesfabric.com/images/upload/File/98022145751.pdf
    • https://b2b-intelligence.it/uploads/file/8138855633.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gta+v+online+free+money
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16792 bytes
font_01_sfnt_off0000f2fe.bin
697de8ee97f4077a450410606ff3ad6f3b81305cdef395f83896383496b67bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10424 bytes
font_02_sfnt_off00010aaa.bin
7ff8fb488f2b176c894189eb1b2b991e064a8aded4bec96b56db946b9e98ee85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 17608 bytes

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