Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92e28657fcda34b…

MALICIOUS

PDF

85.6 KB Created: 2021-04-30 12:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 80ab5fb35ddd7b1f79fea86d4cbcadad SHA-1: 23aae11ffb41b6dac0f1115fd3566f3fdcbab6c1 SHA-256: a92e28657fcda34bdc6715e6cee945a059fef938cb7aa9c2dcbdbd3442d467a7
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on disposable domains and exhibit link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://nipisod.ru/strik?utm_term=shark+cordless+pet+perfect+xl PDF link annotation
    • http://metazoaapc.fun/59694258386k4na4.pdfIn PDF document text
    • http://mofirixubutibi.getenjoyment.net/66968347738.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/biblia_satanica_romana.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/what_is_the_meaning_of_the_song_fly_me_to_the_moonkhazg.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/lezajigisidije_zatutavukasip_zagiwizu_pirubozaledu.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/ada_mp1_classic_schematic.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/identidades_trigonometricas_concepto.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/ehhidjf/16257107780.pdfIn PDF document text
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/7070901.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/how_to_increase_self_confidence_in_public_speaking09vj2.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/79400315854.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/2a86b0dfdc03ae.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/bionaire_humidifier_filter_change.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/TYcKig8/banjara_dj_song_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pewokes.epizy.com/68553897976.pdfIn PDF document text
    • http://bemabam.myartsonline.com/catharsis_by_aristotle.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/sled_driver_brian_shul_download.pdfIn PDF document text
    • http://gezixus.myartsonline.com/burda_patterns_download.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/geometric_and_arithmetic_sequences.pdfIn PDF document text
    • http://gamadajizi.rf.gd/piano_music_sheets_easy_pop_songs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 5476 bytes
SHA-256: 0b0b309029a256c62a3f422ad011a5a04e42ba9b305c9b3eca5e180bdd925501
font_01_sfnt_off00010d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D49 11144 bytes
SHA-256: 080a66fe017abcf59f1f1500b68c1d456d690b7e33d7887eee8fb4854df68c35
font_02_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 16232 bytes
SHA-256: e1fcaa290bc8b5aed85f312864440120c61db6abd2add9737883d56687aaee62

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