Malicious PDF — malware analysis report

Static analysis result for SHA-256 539e043f1c58597d…

MALICIOUS

PDF

78.5 KB Created: 2021-05-16 15:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f7160619b88e597fdf9fbfab48c3488a SHA-1: ee4006175b7641d85c4831f2fe58c7b1ea0edcb2 SHA-256: 539e043f1c58597dc80c6c17d66f60933b3181c9e27d4d02104d5228ecfef33d
126 Risk Score

Malware Insights

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

The PDF document contains an embedded URI that redirects to a URL disguised as a search result for a common query. This URL is part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a phishing or exploit site.

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://druttle.ru/strik?utm_term=how+do+you+program+a+rca+universal+remote+rcr414bhz PDF link annotation
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/galuk.pdfIn PDF document text
    • https://minovenuk.weebly.com/uploads/1/3/4/3/134306780/e6056482eec3f.pdfIn PDF document text
    • https://gebifafotuzuwi.weebly.com/uploads/1/3/5/3/135324040/bawaxijofevez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_60313d68dec2a.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/84e17f884242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_60069f00bdd76.pdfIn PDF document text
    • https://lerekisisag.weebly.com/uploads/1/3/1/4/131408666/8b0334cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fd60c0043b00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488349/normal_5febe035b2283.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/bupesejirijejus/coast_guard_marine_safety_manual_volume_iii.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/twilight_saga_movie_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/libuwojenojirivepasid.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/87212265921.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_b8d991b36912441b8a5ae2c6bd08da1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/what_are_the_best_deals_at_walmart.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_a74ac3e680d34196baaa9b6c337e1d8b.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_4fce986a74494dd39440b360e9a35b5f.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f57b4c292e9347339af3f2db8ba8e80f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/introduction_to_applied_linguistics_schmitt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d2e9fd-5bd6-46ab-a7fd-71a48691c152/gisufavebazuwidirijituvux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b105dc-877f-4ab8-bb51-573e2d2630ae/organic_chemistry_is_the_study_of_compounds_containing_weegy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8877064-bcdf-432a-a4c8-755fc8a3990c/sewizativudovupatifune.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_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 6032 bytes
SHA-256: a6b6acbf049889bf1baf836bbb78956bfa22fc72f3fb67300bca9c501c2c7a35
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 10500 bytes
SHA-256: 0a712ca09016d681eebdc0417981f61506384a4ebf86fe6f4f7850cbbe293a39

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