Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa96eac0c699a04…

MALICIOUS

PDF

116.3 KB Created: 2021-02-06 15:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b946eae1911f8c3434efac6f60393f94 SHA-1: ea1f0aa79e1a8fd6bf4326092bdfb815309d0f61 SHA-256: 0aa96eac0c699a04e8bdf18acb38c013072a8146eae129574ecd4cd521c6c4b7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent link pointing to 'https://jacksth.ru/aws?utm_term=flue-+cured+tobacco+curing+guide', suggesting a lure to a potentially malicious website. The PDF also contains a link farm heuristic, indicating it's part of a network designed to drive traffic to other sites, such as 'http://luxizetugo.epizy.com/70762250765.pdf'. No scripts were extracted, but the overall structure and link farm heuristic point towards a phishing or malware distribution attempt.

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://jacksth.ru/aws?utm_term=flue-+cured+tobacco+curing+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff33d9a9304a.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/8530273.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/3401271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5ff6ada9f1ce2.pdfIn PDF document text
    • http://pitushok.space/albuterol_hfa_davis740on.pdfIn PDF document text
    • https://zimuwinosozenuj.weebly.com/uploads/1/3/0/7/130740464/zafuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxizetugo.epizy.com/70762250765.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/34096206094.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/solving_inequality_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/tomegukosagofusujaxefeput.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/witagepigaluninojir.pdfIn PDF document text
    • http://vomifavub.epizy.com/uscg_auxiliary_form_7029.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/woolworths_chicken_mince_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/11856603453.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/pokemon_leaf_green_rom_coolrom.pdfIn PDF document text
    • http://sikofus.epizy.com/avengers_endgame_trailer_2_hd.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_off000189b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B2 5056 bytes
SHA-256: c7500c6519ac5b43899c3f85959da193c605943fd6b8d6de0619b2ef00cd5d53
font_01_sfnt_off00019af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AF8 12552 bytes
SHA-256: 37912d38b37bf5a61d855b45ce8e97db46d10dc5650b79069173aaca38d329c6

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