Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d20355de90be959…

MALICIOUS

PDF

73.8 KB Created: 2021-03-15 21:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 752a7027e9a80a9b4d2c7926a73f8551 SHA-1: 23b1518ca4f7f8966ae1da234a58bac4847f700c SHA-256: 4d20355de90be959686cc72963cc1408c65ed4d63790b4db64267f8361662de1
184 Risk Score

Malware Insights

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

This PDF file is classified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least two pointing to known malicious redirector infrastructure and disposable hosting. The primary attack pattern involves luring users to click these links, which likely leads to further malicious content or exploits.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=o+positivo+doa+para+quem In PDF document text
    • https://vukuwapebu.weebly.com/uploads/1/3/5/3/135310377/suzap.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/york_diamond_80_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/g9jccH1/kalepuvaxeganexejer.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/hhhbtih/19093079805.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/what_is_a_composite_score_wisc.pdfIn PDF document text
    • https://sojenakituvewo.weebly.com/uploads/1/3/3/9/133986345/870886.pdfIn PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/how_to_reduce_into_smaller_size.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/gcwgeyp/49077565039.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/CAgeEhj/vomofakulurivililovoro.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/e0bd1.pdfIn PDF document text
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/180742.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/a09906518.pdfIn PDF document text
    • http://rotawafuwuno.scienceontheweb.net/probability_tree_diagram_notes.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/what_is_the_research_in_social_work.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/nejopijapiku_tigiriwe_wubosaruxox_rexuwubazaxosul.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/call_me_by_your_name_review_rotten_tomatoes.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/jenukigib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lososimap/filmywap_2018_taqdeer_south_movie.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/868986856.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/what_is_ethics_of_justice.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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 5288 bytes
SHA-256: a87e28a257d4d6e59d7138c0283b0ffa7148cdad4f0409572511f61d2d5c7de3
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 13112 bytes
SHA-256: 18e42a5240a10a1601d4465b0b0e93d806df26f345b3f48163f861a75e4c5963

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