Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b491ead14570f9f…

MALICIOUS

PDF

82.6 KB Created: 2021-03-01 13:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b66f24d3af890c730cf90a17e81d74a SHA-1: 5546dc1f237bb7041cc2140e8a3b9cb70fda13a0 SHA-256: 0b491ead14570f9f7b89edbe46266f7c76989720c5f4442cfbab53a3bc8ea504
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many hosted on disposable domains or link farms, suggesting an attempt to redirect users to malicious websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wb?keyword=un%20historia%20de%20la%20lengua%20espa%C3%B1ola%20materia PDF link annotation
    • https://cdn.sqhk.co/veletafi/ibggcje/air_control_lite_tips.pdfIn PDF document text
    • http://terugate.mypressonline.com/simone_de_beauvoir_the_second_sex_quotes.pdfIn PDF document text
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/ca34bc28.pdfIn PDF document text
    • https://verulofu.weebly.com/uploads/1/3/4/0/134012380/vefatugeruv_wigilim_tibugen.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/25586895072.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/fxs_a_christmas_carol_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_602c83a5889d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_600819b452947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457281/normal_5feb83bca88bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5fda036f4bc14.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/lonolo.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/who_is_the_killer_in_dark_season_3.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/sumizela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 5576 bytes
SHA-256: 60a269fd85de059a88a62a0d8bb57751eeab257f15ab89f766ae915ef95a8c37
font_01_sfnt_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 12744 bytes
SHA-256: 336d2d13d744f2cb4423dd778e70e16d8171318e9ff32698088ad3a456f72d0b

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