Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc9c6dc3b82be0e…

MALICIOUS

PDF

78.3 KB Created: 2021-02-25 17:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 14b51071c47ae5f0b4a845e87e959603 SHA-1: 75e1b7452fec57fc24041f8b873fe6dc7176b3ad SHA-256: 0bc9c6dc3b82be0e3284ab3198dcb930cc83af3e05403cc27832e1775cce8a20
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/award?keyword=bell+jar+definition+biology PDF link annotation
    • https://cdn.sqhk.co/xuwifoviwalo/eigDBii/mineral_wells_weatherford_college.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/hfhcgdA/salirenime.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/tekovot.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/3HjaidL/mobile_passport_control.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/gixupubazisok.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/wemo_maker_alexa.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/pofil.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/keruvup.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/rulilipusexanijase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisedij/best_android_games_free_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/55260468184.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/attribute_changer_for_windows_7_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/xotoladitolodu.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/rubopojobekojosuxupu.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/82111181629.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/sajizozesumomasuj.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/dopibesujularopezatiferi.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_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 5264 bytes
SHA-256: ad089eca97ba8a6ce7e67ac4faed434a2ab1262866dbd073f65aa3fb0579f401
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10112 bytes
SHA-256: 5e6a7ec4af54b920aa8e31f2ed5b9edbd7de3c7066930c7b559f92fad026eee8

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