Malicious PDF — malware analysis report

Static analysis result for SHA-256 35113f3cb606414e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 19:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 664ffb12f6081ab2d8f2021a416c66dc SHA-1: 2af48d4c3e04abfd69fab454eed72613c6968f72 SHA-256: 35113f3cb606414e9b9a22c2197e3f1bbabcee09a1aaf3a96606df59e435eaf4
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of numerous external URIs, including those on weebly.com and mygamesonline.org, strongly suggests an attempt to redirect users to potentially harmful content or phishing sites.

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://seumenha.ru/123?utm_term=altera%25C3%25A7%25C3%25B5es+cromossomicas+estruturais+e+numericas+pdf PDF link annotation
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/tugon.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/6093465.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/ruger_mini_14_scope_mount_installation.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/blogspot_libros_juveniles.pdfIn PDF document text
    • http://wabixekere.iblogger.org/luwipir.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/3519374.pdfIn PDF document text
    • http://xobezised.iblogger.org/buzzfeed_gift_guide_for_him.pdfIn PDF document text
    • https://vonipelimodaro.weebly.com/uploads/1/3/0/7/130738487/zitotunemod.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/b1df54a9a30d76.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/sunagililixafuxu.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/3029268606.pdfIn PDF document text
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/refol_zoxexazu_tukufamane_fuzakix.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/8274816.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0baa8ca7-149d-4bd4-b799-8dbf7cabb76a/doro_phone_instructions_5030.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/94891786364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c69c7d0-76ce-4558-bbf1-ddf430cf58b9/shiver_maggie_stiefvater_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62da1b37-dfa1-4321-bb7f-b20728d524a8/tezonolinasupigofiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c6042b-ae4a-41a0-8de5-aecf1e027bdc/is_little_house_on_prairie_on_netflix.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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 5688 bytes
SHA-256: dc65881b7dbe61c7fedbbc1b2466bac930d4638ca17444de1a23519670de7600
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 13268 bytes
SHA-256: b079fd11236565cd5dfc1c96e2fef284a0d07f99d4428272244360d720342f7e

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