Malicious PDF — malware analysis report

Static analysis result for SHA-256 653d1da522fa5849…

MALICIOUS

PDF

93.7 KB Created: 2021-04-10 16:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 58836d94e9766de15f3029c446b34008 SHA-1: e493f0219fed6952371892ba15bd0256d6c9bfa4 SHA-256: 653d1da522fa58497119e46869ef528dc1d2c65f120261f0d9cb500cbd503805
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://mezovuduw.ru/strik?utm_term=what+games+to+play+with+your+boyfriend+over+the+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469119/normal_602c0cd546030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6024930b591b4.pdfIn PDF document text
    • https://rikodobuged.weebly.com/uploads/1/3/1/6/131606346/wopogukake.pdfIn PDF document text
    • http://salonapp.xyz/karr_alarm_honda_pilotphm9o.pdfIn PDF document text
    • http://uaregroup.com/260209961701i4ll.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497071/normal_5fff7c698435c.pdfIn PDF document text
    • http://nibelv.xyz/parallel_lines_transversals_and_algebra_worksheet_answer_key_gina_wilson9mwvo.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/1914838.pdfIn PDF document text
    • https://dinozijumuf.weebly.com/uploads/1/3/4/3/134315767/rujesaxobajuvun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5ffd689236abd.pdfIn PDF document text
    • http://ooovseanalizi.ru/sovutaluporemoka6r9ez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fe263de3720a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_6016f822e8be6.pdfIn PDF document text
    • http://startask.ru/256392267209wrhz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gigitepusiligo.epizy.com/fivopelerovonevor.pdfIn PDF document text
    • http://jawafezirosozo.epizy.com/21825809044.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/74848853977.pdfIn PDF document text
    • http://kizuwopo.epizy.com/java_parseint_numberformatexception_hex.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/sofemupomovopetogo.pdfIn PDF document text
    • http://kiwimusef.epizy.com/guia_prtico_ilustrado_para_biomagnetismo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 5744 bytes
SHA-256: 6367810e02a4810cb2380b47fd6494b76e3f57a6a1aeb9219fad936a133807be
font_01_sfnt_off0001349a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 11420 bytes
SHA-256: def1829e0535484f6937a8a94eefc09b87fee962671869a96f371e163f1ee75a
font_02_sfnt_off00015afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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