Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85f6148fbb176c8…

MALICIOUS

PDF

102.9 KB Created: 2021-04-03 17:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1afc70c28f247d428feb8653729aede3 SHA-1: baf4ecfffba134a738e6e9d5acc789fa1f370ab4 SHA-256: c85f6148fbb176c8e700b463f911fceed9fbc82514a84dd8bc757fe36132210d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the overall structure suggest an attempt to distribute malware or conduct phishing attacks.

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://golowaki.ru/strik?utm_term=the+road+warriors+entrance+wwe PDF link annotation
    • http://tezibif.mygamesonline.org/zuwozobugikaresimav.pdfIn PDF document text
    • http://itnegozio.info/93546042138yvpkk.pdfIn PDF document text
    • http://tiktokfrance.fun/oxford_advanced_learners_dictionary_onlinej6sme.pdfIn PDF document text
    • http://italywow.info/73774741950mi9lk.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/apowersoft_online_editor_review.pdfIn PDF document text
    • http://fullhp.info/gardens_of_the_moon_summary_reddit1cwll.pdfIn PDF document text
    • http://rasprodavaika.ru/gadejifexovolofudakujalcnnmn.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/bukapabul_liritugomiz_dabazivefedi_mumirarelabuk.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/lijututo.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/xudorefekivix.pdfIn PDF document text
    • https://sixevajerav.weebly.com/uploads/1/3/5/3/135341720/513600bdb920f.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/1783-etap2f_single_modea91dc.pdfIn PDF document text
    • http://reweder.site/dell_latitude_e5500_memory_slotspuuc6.pdfIn PDF document text
    • http://tugrull.com/pitowadasagarixofafufila7wisr.pdfIn PDF document text
    • http://terugate.mypressonline.com/63196988890.pdfIn PDF document text
    • http://vengriya.space/jozuleveroviripubopanoxoyh8hi.pdfIn PDF document text
    • https://xagajopudulu.weebly.com/uploads/1/3/4/6/134697977/51985.pdfIn PDF document text
    • http://beststudent.space/hells_vengeanceh8f05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_772f4836c548437c9ef8321e352c48f5.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_d63ab8c4b2984da1b3548dd2f4fc2c36.pdf?index=trueIn 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_off0001452f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452F 4928 bytes
SHA-256: 6cef4d9c104fa6de1d60ac8e6b76476c13b5f7df4513b430cf7fd34cd308787e
font_01_sfnt_off0001565e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565E 5036 bytes
SHA-256: 5365f59889c85700b4909ccfec7064654f3b45f175981d2684e0df4669f9f373
font_02_sfnt_off00016787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16787 11480 bytes
SHA-256: 539c8479dcb17e973bd819d574bb7893fe9a0a32f78da77767098227cf65550c

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