Malicious PDF — malware analysis report

Static analysis result for SHA-256 83df5a4301e868da…

MALICIOUS

PDF

66.8 KB Created: 2021-02-26 19:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d3ea2a735fe426a2583b332f0123dc57 SHA-1: c226def7830bcda70670c5449f3ee4586cd0416e SHA-256: 83df5a4301e868da003071ec84f5614a42f355cf5aa5d4b9fb3ad7c8b7c8508d
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominent URL pointing to a domain associated with phishing and link farming. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://maypoin.ru/award?keyword=marine+safety+officer+course+in+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445743/normal_601b18ba47ed5.pdfIn PDF document text
    • http://velavedi.iblogger.org/81327683512.pdfIn PDF document text
    • http://vuxiparami.22web.org/jisurimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_60357e732b300.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/dont_let_me_be_lonely_claudia_rankine_ebook.pdfIn PDF document text
    • http://batizilojado.22web.org/2311003719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dibulazovila.rf.gd/lipics_proceedings_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/secure_vpn_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/pagalworld_bhojpuri_dj_song_2019.pdfIn PDF document text
    • http://joriboka.epizy.com/zijanowop.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/98288597539.pdfIn PDF document text
    • http://fokogijisigife.epizy.com/que_es_analfabetismo_digital_en_informatica.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/email_attachment_format_excel.pdfIn PDF document text
    • http://gebaruzowulidus.epizy.com/23165792067.pdfIn 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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 5088 bytes
SHA-256: 77ed444d2f75e4fdac03021982cb69781d931a599d66cc1542ffb7b11c56510e
font_01_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 9972 bytes
SHA-256: 753d93c2f1145f40745c4e3889e492febaa03ffbb1ded1ef6acae95e1f6ba3bc