Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8de2948decf604…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 09:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a520a5c82c143e81e7ad6ec443af7241 SHA-1: a26e31bd1027ad97be58d90dbb9bd0a2af20a2bc SHA-256: 1a8de2948decf604b2aa24442794e8703ac8fc72738e72c0640d3b3152584d26
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=sennheiser+rs+175+multiple+headphones PDF link annotation
    • http://durikudu.iblogger.org/wulisowasilu.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/jiiaiaZ/gba_emulator_ios_june_2020.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/gutefovemuja.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/flysky_fs-i6_firmware_upgrade_10_channels.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/iKoigcE/star_wars_battleship_1997_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/idhgagi/keboninoxogawuwogemu.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/70676687074.pdfIn PDF document text
    • https://cdn.sqhk.co/gotubosif/hihdggw/4851192905.pdfIn PDF document text
    • http://wosedumuf.mywebcommunity.org/17219847763.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/when_did_schools_shut_down_for_covid_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d729191f-518f-459b-ab78-0d3528cd9c6a/ansys_ls-dyna_users_guide.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/agnes_of_god_play_script.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/norton_antivirus_for_pc_with_key.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/osprey_atmos_65_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/ardingly_college_sixth_form_open_day.pdfIn PDF document text
    • http://mokijogibosa.epizy.com/44139465303.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/our_bucket_list_adventures_a_journal_for_couples.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/67514184885.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/19552687237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43594923-7710-4c63-a610-6c188528e771/asp.net_mvc_core_attribute_routing.pdfIn PDF document text
    • http://jedirolin.rf.gd/42421219751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912f1840-f484-40aa-bc09-5ab3f666df54/71016124761.pdfIn PDF document text
    • http://delixerilebuk.epizy.com/vinusamunamuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23c1401-cf45-4990-92b3-85515c239d84/20998806184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7d9725-aaa4-46bd-9490-7eee64207588/medios_de_comunicacin_interna_en_una_empresa.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_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 5556 bytes
SHA-256: 71082916a398ef4a9d79c42b2e0122749cc8f166160e5966b31ea1ebd0449e70
font_01_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 11908 bytes
SHA-256: ec38e8952eb8b79f5bcccbe75096a588c74d8911eb4a9aee989968017ea542c4

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