Malicious PDF — malware analysis report

Static analysis result for SHA-256 5548f6a449e9f2b5…

MALICIOUS

PDF

88.6 KB Created: 2021-06-03 07:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5e4526e61ae50aa5610d0f22c400280d SHA-1: b342fc9861dabdeaeed7db4b8c3d22a90150159f SHA-256: 5548f6a449e9f2b5395255eb441df8d212c6a09e6d42e21724a1c5100590d845
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/pbw?utm_term=que+es+el+arte+en+la+edad+de+los+metales PDF link annotation
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/1253276.pdfIn PDF document text
    • https://vijamosikafej.weebly.com/uploads/1/3/4/7/134772382/f15c8047bdb6.pdfIn PDF document text
    • https://derixajulinam.weebly.com/uploads/1/3/4/3/134356287/e04b96447a66.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/5026968.pdfIn PDF document text
    • https://zemojedi.weebly.com/uploads/1/3/5/3/135333580/5945322.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/b0867b1b00bcc72.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/dowumu-mojotagogonoj-suxudovejudi.pdfIn PDF document text
    • https://lusulabudigesa.weebly.com/uploads/1/3/2/6/132681481/werupuxufit.pdfIn PDF document text
    • https://rilodogalaru.weebly.com/uploads/1/3/4/3/134398508/susilexofogabup-kagogevodowita-vokojexilara.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/jubibepabukisa.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/bibin_jikij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sofutikajen.pbworks.com/f/circuito_paralelo_ejercicios_resueltos.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144411609/68024656535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06493fb-f153-4d0d-8aa0-5b73d81c853b/why_does_he_do_that_lundy_bancroft_online.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144508278/inventory_valuation_methods_questions_and_answers.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144415326/msp_hack_generator_2019.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144445167/bupakuvujogelonu.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/solucionario_matemticas_1_bachillerato_santillana_proyecto_saber_hacer_serie_resuelve.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/w/file/fetch/144537123/detudovitovovezavukox.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144416319/mopinutigazopasemojapawap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8796fa3f-61e4-4cf9-b2d9-b280d64c3c68/wuxovajapozep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924a65a8-8f0a-4deb-a0d7-72bf75ba5e8b/13523832236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2baf19a-c19c-494f-b6a2-91f40f571fad/93915520678.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/34747599122.pdfIn PDF document text
    • http://jetubabup.pbworks.com/f/williams_obstetrics_24th_edition_download_free.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_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 5032 bytes
SHA-256: e5d1a6de18c6efaf3d44c7a5fcfb69b359f9edfbbe22e0a4299a4ad05a3e7ba7
font_01_sfnt_off00012d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 11692 bytes
SHA-256: 3c1ae79943afeac0d8ddaa28ee2001d4cb6a46220cbbfd2529bd89be23bc8e49