Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4208bc8a69b84a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 15:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aa3d340d87d0c3ac27849a4b52d4b3e0 SHA-1: 9bffd7101a58cda3d7604a147f9d8c050cf295ad SHA-256: 1e4208bc8a69b84a2a39a83b4ad86f72fe55edb8087d6113f750b62259f8a61e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains keywords related to child separation anxiety and the wkhtmltopdf tool, indicating a potential lure. The presence of multiple external URLs, including one pointing to 'baarspo.ru', strongly suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

Heuristics 6

  • 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.
  • 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://baarspo.ru/award?keyword=ansiedad+por+separacion+en+ni%25C3%25B1os+pdf PDF link annotation
    • http://nubigawe.22web.org/86791194280.pdfIn PDF document text
    • https://megopupe.weebly.com/uploads/1/3/1/1/131163834/1181c63.pdfIn PDF document text
    • http://tefituguj.iblogger.org/how_long_does_it_take_to_write_a_novella.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/0be5dc6.pdfIn PDF document text
    • http://vawuxipofuf.iblogger.org/14503295623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vefagukolile.epizy.com/agneepath_dialogue_hd_video.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/homopolar_generator_seminar_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3eaaeae-0c56-4e78-a526-f4fd744fcca6/vidinorafazupobefin.pdfIn PDF document text
    • http://lesofowan.rf.gd/expense_tracking_spreadsheet_for_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2f5391-fe74-448f-bd3d-2a34680b2a6b/39605829265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649285a9-3e45-42d1-8cd8-00f9cb2824d5/dofivibepuxit.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/what_does_the_red_triangle_warning_light_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee929c8-1239-4038-a7df-24b1e4cf2ce6/where_is_the_filter_located_on_a_kenmore_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23baebf-1952-473a-a7d2-6ccac99c29c9/a_w_tozer_books_amazon.pdfIn PDF document text
    • http://xazinipigoxowe.epizy.com/shoot_hunter_gun_killer_game_uptodown.pdfIn PDF document text
    • http://pisozirepuwi.epizy.com/14379427183.pdfIn PDF document text
    • http://bekegukuvaliji.rf.gd/55526359805.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_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 5320 bytes
SHA-256: bf3b580736ed9322ccec998e55cf51686207d8979ec63ebfa690033eb3c17a72
font_01_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 11072 bytes
SHA-256: 6e967e61c0abf425963862f561e70b1c24084cfd9db8a7fc7a70618499eafe7e

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