Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5fe57a7e903218…

MALICIOUS

PDF

80.4 KB Created: 2021-03-31 20:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 510325cfb719cbc8e7cd4820f22bad08 SHA-1: 8016bf9ade95d6024f28aca64150455888e75574 SHA-256: 2a5fe57a7e903218abe9e559b666e49c9938ccfab7c0895b0aa1202db581feec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=what+is+the+smallest+human+chromosome PDF link annotation
    • http://tevalevas.22web.org/powedaliv.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/ruger_mini_14_scout_scope_mount.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/mebon.pdfIn PDF document text
    • http://judifino.iblogger.org/begifezitukujareru.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/nunafaselebisowapin.pdfIn PDF document text
    • http://wubarikenokepi.iblogger.org/64511942516.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/atmosfera_zero_libro.pdfIn PDF document text
    • https://xepekozodixati.weebly.com/uploads/1/3/5/3/135346226/6328d217a787.pdfIn PDF document text
    • http://vuwavutos.iblogger.org/kedafexebir.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/pasexaxobokujajerinef.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/hari_arora_applied_mathematics_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajipenu.epizy.com/sivudererafujor.pdfIn PDF document text
    • http://sigukig.rf.gd/minobiponexanuladefodupoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4170de0-e1a8-4820-970a-b2ce79bf43d2/pebaritabesorivovudexalep.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/soda_stream_gas_refill_melbourne.pdfIn PDF document text
    • http://nitufuluxa.epizy.com/american_criminal_justice_system.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/blank_buyers_guide_paper.pdfIn PDF document text
    • http://xanabakawori.epizy.com/basic_heat_and_mass_transfer_mills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75196f44-8102-4113-98ed-511f54e76af0/tebovulokituvijo.pdfIn PDF document text
    • http://vorinemoxolupip.rf.gd/33020546662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8437408c-013f-4407-9761-0a8897464e63/3775983589.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/gw_basic_programming_language_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/code_de_la_route_les_autres_usagers.pdfIn PDF document text
    • http://roxemab.epizy.com/consequentialist_theory_of_ethics.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/beginner_strength_training_routine_for_weight_loss_at_home.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_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 5052 bytes
SHA-256: 9659a269bb7a9c04f6ce3a8c5e352d51e2d36f847f07be165df265d5d06d7edd
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10276 bytes
SHA-256: b0db9c0176c51acfc6030b47bfe3680a3a4d570a23cf2c5c78a7fbab4db369c8

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