Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f4046752f90aab…

MALICIOUS

PDF

75.2 KB Created: 2021-04-03 03:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a16fbb4ef1049967d1867186068cf02f SHA-1: 084e3754bcbd5347e5125974788d392bab48708c SHA-256: a3f4046752f90aabc572179df041f4bb74efd6f6580b15c678cd83e8cd2a30a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/wix?keyword=arctic+fox+poseidon+on+dark+hair PDF link annotation
    • http://guzexesuge.mypressonline.com/11848457009.pdfIn PDF document text
    • http://rent-nout.site/suunto_ambit3_bandjeu7y02.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/dojaval.pdfIn PDF document text
    • http://tibetterrier.ru/what_are_the_edit_commands_in_autocadrsphj.pdfIn PDF document text
    • http://reweder.site/how_to_turn_off_music_on_ottlite_desk_lamp2cg45.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/data_science_masters_online_australia.pdfIn PDF document text
    • http://italia-doc.fun/voxizopemunutufhsyl.pdfIn PDF document text
    • http://dekovag.mypressonline.com/analytical_report_format.pdfIn PDF document text
    • http://de-bewertung-889562.icu/rabamijeseky316t.pdfIn PDF document text
    • http://sodobinefudiguw.iblogger.org/chloroform_water_extraction.pdfIn PDF document text
    • http://soldonlakewood.com/pulafitidupefthxo3.pdfIn PDF document text
    • http://fakaripeti.xyz/boxirefifufomofuxazhovlc.pdfIn PDF document text
    • http://tricitysikhs.com/acer_aspire_one_722_release_datefqhs8.pdfIn PDF document text
    • http://werenntaq.online/33448675509ti57h.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/1680379.pdfIn PDF document text
    • http://indital.fun/alien_vpn_apk_uptodown0bj2h.pdfIn PDF document text
    • https://tatuwimo.weebly.com/uploads/1/3/4/8/134882860/maluxile.pdfIn PDF document text
    • http://istlan.space/42749047724ouawd.pdfIn PDF document text
    • http://wildboost.club/faladadumomewijarabokosqni2j.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/jumusegagikimitetu.pdfIn PDF document text
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/4280399.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/ps_vita_memory_card_alternative.pdfIn PDF document text
    • http://cloudmarket.website/dimensiones_montacargas_cocinalzfrm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokafupu.rf.gd/vehicle_routing_problem_excel_template.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_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 5332 bytes
SHA-256: 32c64f879d10bc9679436270620957b78f81d769024c47e246b766981eb010a8
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 10932 bytes
SHA-256: a2135d0a0439bfd7f2b4c833fc727ec081f38c0be6e7d9d12892b9692ddbbb32

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