Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3631ab3a096aa0…

MALICIOUS

PDF

86.1 KB Created: 2021-04-17 05:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 746dc4e184b065ac7144c733eed84940 SHA-1: 0475e875cea1ebad1ef7a46bce40a03da859b9d2 SHA-256: 3d3631ab3a096aa032e81dfb57919c98297bacc2deabc91a3ba24449f0fcebed
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary one pointing to a site related to 'how to build muscle at planet fitness', suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous disposable hosting links further supports a campaign designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+build+muscle+at+planet+fitness PDF link annotation
    • http://picsonair.com/memolon1pln0.pdfIn PDF document text
    • http://i-men.ru/59040392934jhibk.pdfIn PDF document text
    • http://resimpub.com/iso_9001_revision_2015_free_downloadkkecb.pdfIn PDF document text
    • http://mattelipsticks.site/dihybrid_cross_worksheet_answer_key_miceplxyc.pdfIn PDF document text
    • http://mini-cam-v2.club/what_is_the_formula_for_a_22.5_degree_offsetv6b4i.pdfIn PDF document text
    • http://nafugelinev.iblogger.org/34258270384.pdfIn PDF document text
    • http://gobigs.space/english_songs_club_mix_freenrd7j.pdfIn PDF document text
    • http://tells.fun/sharp_aquos_quattron_70_weightum3wq.pdfIn PDF document text
    • http://legko.travel/marlin_model_60_pink_stock_for_sale09feo.pdfIn PDF document text
    • http://verification-help.business/orbit_12_station_sprinkler_timer_with_remote_control_manual7to1r.pdfIn PDF document text
    • http://callup.today/nilixetifigameze86r6y.pdfIn PDF document text
    • http://neo-tp.ru/crock-pot_4.7l_hinged_lid_digital_slow_cooker_-_black_instructionsyeugd.pdfIn PDF document text
    • http://rfs.team/kaxugiwebuxidizq7r8z.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
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_e7b6949b0bf34faa81c30e87540760f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c18ab15-3145-4d92-9d83-18b491721cac/64606028204.pdfIn PDF document text
    • http://faxaxesaxejov.rf.gd/wolipiriwibasuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829df21e-74a8-40c1-a5b3-2b5d62a4c689/how_to_find_an_image_id.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900390c5-16d2-43da-aa4e-5326309ce399/how_to_reset_suzuki_outboard_service_alarm.pdfIn PDF document text
    • http://zuriromaruwo.epizy.com/psychology_facts_in_tamil.pdfIn PDF document text
    • https://3c31dc6e-14a3-4e60-a373-897e90814001.filesusr.com/ugd/9e17d8_c33b4efbb1c64678a36359e8ecbf69ac.pdf?index=trueIn PDF document text
    • http://kivekedifewu.rf.gd/om_music_for_meditation_free.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_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 5280 bytes
SHA-256: 8204f11659b0b1b1fbdf149d7d91edb81bd979e4478e5fe2e3ca453fc99e5ef9
font_01_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 11568 bytes
SHA-256: 1b4c45bf1dc174e502b1cf50feeb732673746d1c3d1cd21f0605c2574341f7dc
font_02_sfnt_off00013c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C75 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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