Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f10db4256fe5d50…

MALICIOUS

PDF

84.2 KB Created: 2021-04-05 23:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a3fe21ee2f76f282cf41447f4f630219 SHA-1: 5a91eec8e3a8c1067e97b9d1810c6efa4ca4fed2 SHA-256: 5f10db4256fe5d502d2aab339e1358a02b31a3d6b27c2e037f23546995e00f7c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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://soxebez.ru/strik?utm_term=cuantos+kilos+tiene+un+metro+cubico+de+grava PDF link annotation
    • https://cdn.sqhk.co/benanejufa/eSIWodh/womikugugidabuwo.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/fatibavigagomesa1nu0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470964/normal_5fce011f555e7.pdfIn PDF document text
    • http://freshmind.net/netgear_fast_ethernet_switch_fs108_manualwvvc5.pdfIn PDF document text
    • http://birjand.design/stock_market_technical_analysis_chart_patternshp6bk.pdfIn PDF document text
    • http://stixlife.info/pride_and_prejudice_free_online_movie_2005sc945.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/ylidTpj/lobowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6042e0d9aea5e.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/iaiisgh/assamese_tokari_geet_song.pdfIn PDF document text
    • http://housefashion.ru/kajutexebesoferizowamab08iti.pdfIn PDF document text
    • http://reliables.ru/zinamevakufan39pfi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_6062b4711ccfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_605c6f4182426.pdfIn PDF document text
    • http://qwonder.space/how_to_put_together_total_gym_platinumyajy3.pdfIn PDF document text
    • http://delayikapy.xyz/wedopuzududubofilv5q0n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416923/normal_6003b1e701d27.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://jujewejono.epizy.com/83102039787.pdfIn PDF document text
    • http://dofomexikokubeb.epizy.com/tawetubof.pdfIn PDF document text
    • http://poxemibusap.epizy.com/mixed_ionic_and_covalent_naming_practice_answers.pdfIn PDF document text
    • http://sesoxevanadike.epizy.com/bowoxixafunetata.pdfIn PDF document text
    • http://dijinisefiregot.rf.gd/xfinity_connect_app.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/wadiruwexulufexerevazodub.pdfIn PDF document text
    • http://gazobulusobu.epizy.com/ajax_logo_vector.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_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 5428 bytes
SHA-256: b1569ac8e0dc68c73282534f32dadbeaea1fea80eef34ed453374676fcd9661f
font_01_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 13036 bytes
SHA-256: 5e2ffb14575fede9b978a9535cc98d4c8ae7ed1ac43a7a08424a4a15dddfcb5b
font_02_sfnt_off0001332c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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