Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eff1b38256712b9…

MALICIOUS

PDF

91.9 KB Created: 2021-03-04 01:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ada76b7e98f97d2b8050cc96648c336f SHA-1: 632cec6677f60ac7ca8de76dadcfb43725d74d80 SHA-256: 1eff1b38256712b9c5bad57a4b3b759c21a6dd7a42e9e81073dcfde10909d799
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One URL, 'https://ponafet.ru/strik?utm_term=offseason+soccer+workout+program+pdf', appears to be a redirector. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ponafet.ru/strik?utm_term=offseason+soccer+workout+program+pdf PDF link annotation
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/jofaxenafakarexo.pdfIn PDF document text
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/vizugokevel.pdfIn PDF document text
    • https://cdn.sqhk.co/kazakilen/jAhvgii/diy_hand_drill_press_stand.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/what_are_the_types_of_viral_tests_for_covid_19.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/hihbjf6/castle_of_illusion_game_free_download.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/sidugeputosuta.pdfIn PDF document text
    • https://joweralifaj.weebly.com/uploads/1/3/4/3/134350132/7431176.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/fghDbhd/adobe_illustrator_draw_ipad_vector.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/wefawukevudosikafo.pdfIn PDF document text
    • https://mogiveruxapexi.weebly.com/uploads/1/3/0/7/130775775/lisax.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/zudowijon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikutixutawax.epizy.com/spoken_english_course_book.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/gogavunadafemizifa.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_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 5624 bytes
SHA-256: c3fc110c7a74369a530eb34d4cbd0a373c9413277df00b7a7a84a0e8b7239d7c
font_01_sfnt_off00013d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D13 10968 bytes
SHA-256: 5f1a89aae0ebd0c4a7910733bb532da84f96017e775da7f67376cc12c5ece950

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