Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d99c0a77ea27fe…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 04:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d18b61881fcad130cd63b7ea2d4b0a3c SHA-1: 74c934e9ae88e02c98c258af7276716405d7461d SHA-256: f4d99c0a77ea27fe4c5211a3f169ac5465e998bd3aa8e03238d1037236035a25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://dafemum.ru/123?utm_term=ethical+behavior+in+organizations+pdf PDF link annotation
    • http://neyroskakalka.site/39640656077n6ocz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fd1a8bbad99d.pdfIn PDF document text
    • http://ru-dev.xyz/ms_drivers_license_format3vtgk.pdfIn PDF document text
    • https://totofogekof.weebly.com/uploads/1/3/5/3/135327731/592826.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/3b9d2c31.pdfIn PDF document text
    • https://gevivakeje.weebly.com/uploads/1/3/0/7/130775257/piwunagovinirajeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_6036c3a416fbc.pdfIn PDF document text
    • http://swiss-gear.store/convert_pc_power_supply_into_a_car_battery_chargerixi20.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/7526869.pdfIn PDF document text
    • https://kevifuzokidoku.weebly.com/uploads/1/3/5/3/135310888/gesasa.pdfIn PDF document text
    • http://zdorovienashevse.xyz/how_much_do_i_need_to_earn_to_qualify_for_maternity_payc5p81.pdfIn PDF document text
    • http://keepsufi.space/diludlpu6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_6038ec8f577cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofinawudira.rf.gd/kojulodim.pdfIn PDF document text
    • http://jilevatawew.epizy.com/25133777146.pdfIn PDF document text
    • http://fazavoregotula.rf.gd/49299635078.pdfIn PDF document text
    • http://xefejada.epizy.com/77537624845.pdfIn PDF document text
    • http://gexibaw.rf.gd/gravity_falls_journal_1_portal_page.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/benuxo.pdfIn PDF document text
    • http://zujakogi.onlinewebshop.net/fadatubesojax.pdfIn PDF document text
    • http://mepitar.atwebpages.com/velalisiniju.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_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 5624 bytes
SHA-256: 3b6b033d58f5e515bd5d5d03f7279a77793c138b045732ad24d99a10e81a29ba
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 10108 bytes
SHA-256: 24e5628da41f933c449abc3880ca6164feadd547920314bbe108f04bde819259