Malicious PDF — malware analysis report

Static analysis result for SHA-256 91397fc6257aaeb4…

MALICIOUS

PDF

73.0 KB Created: 2021-04-04 10:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2df9755035d6772431bc6989464e9c34 SHA-1: cb8a35988490bd7dba7e96ac961a6bbdff053918 SHA-256: 91397fc6257aaeb49c8ec03e3a65bed5d9db5b2901845aca8ec02b41ec458377
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a significant portion hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'Guia autometrica 2017 pdf gratis', implying a deceptive lure.

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://gimoguvi.ru/123?utm_term=guia+autometrica+2017+pdf+gratis PDF link annotation
    • http://pogibofabut.getenjoyment.net/70243624595.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/bjisigk/14775737781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_601bafb70a533.pdfIn PDF document text
    • http://kusufuxufatup.getenjoyment.net/12815484763.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/sample_appointment_letter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5fd866419f40d.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/is_the_audio_technica_lp60_bluetooth.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/leijsif/75524853315.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/hageiau/wisigedejilufef.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/WgcLMji/basketball_mini_hoop_net.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumonak.epizy.com/vacuna_antimeningoccica.pdfIn PDF document text
    • http://kemawugaputawa.rf.gd/what_does_red_blinking_light_on_nest_mean.pdfIn PDF document text
    • http://firiveperoju.epizy.com/sazufaziru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cab6403-a723-4a6b-9b9f-86b6563f7ccd/zagg_keyboard_ipad_pro_11.pdfIn PDF document text
    • http://zoxusanobidu.epizy.com/basejazumenaxadebopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f7679f-e692-463a-b875-b15a159b6a4d/dash_diet_phase_1_menu_plan.pdfIn PDF document text
    • http://xebinuv.rf.gd/faneresaxa.pdfIn PDF document text
    • http://sebafasoro.epizy.com/cattle_diseases_and_treatment.pdfIn PDF document text
    • http://femagela.myartsonline.com/the_nutcracker_march_piano_sheet_music.pdfIn PDF document text
    • http://sukivuserofa.epizy.com/how_to_remove_bookmarks_from_old_computer.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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 5880 bytes
SHA-256: b4ed5016d9b21e835f90581a954c66bd38f9702b8d7da9c9b13e63eb50821e12
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 11152 bytes
SHA-256: 5d8ea7660684b748251d14a83961ff3c5dd5cd7bce3f2c62847afcc6f9c18cc3

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