Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73aa2d87d407899…

MALICIOUS

PDF

75.5 KB Created: 2021-05-09 01:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0c98bc0c80b64f9b31be37ef9624def7 SHA-1: b8051dceee4c36cf5b9998a0c4661a6c59fcaa20 SHA-256: b73aa2d87d407899ecce57477a8ff7c61f6e614488654aec37ba5b5306c76ac2
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, mezovuduw.ru, which is likely intended to host a malicious payload. The document body, though heavily obfuscated, suggests a lure related to 'required documents' to encourage user interaction with the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=list+of+required+documents+for+iatf+16949 PDF link annotation
    • https://cdn.sqhk.co/wogefosa/fIIo1gU/tropico_de_cancer_lyrics.pdfIn PDF document text
    • http://jajosez.iblogger.org/kabedo.pdfIn PDF document text
    • http://tigatixe.iblogger.org/gibaguwiteterabasisitedon.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/9jij5Be/tumblr_girl_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/wepaxuwelusu/iuqoRia/nalofusakupuvikig.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/Tib0gjd/world_cup_2026_atlanta_tickets.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/aMejcQh/twister_2_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/jOiggga/pulse_rate_normal.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/Djaihid/touchgrind_skate_2_mod_apk_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/gudupiziv/bV0jgje/riwikopa.pdfIn PDF document text
    • http://katorewudejizut.22web.org/gettysburg_licensed_battlefield_guide.pdfIn PDF document text
    • http://mugaset.22web.org/roxoze.pdfIn PDF document text
    • http://nedugitovo.iblogger.org/aasai_album_songs_starmusiq.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/bibejovixapis/always_on_top_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7448fa-b9c2-4a0f-ba3c-91f2c91b7e73/carrie_fisher_wishful_drinking_watch_online.pdfIn PDF document text
    • http://ruxunuweni.epizy.com/mujatowunatubim.pdfIn PDF document text
    • http://boxitevu.rf.gd/lebumufadakakepuluxo.pdfIn PDF document text
    • http://fesogowen.epizy.com/doxiwerekasegemozigapej.pdfIn PDF document text
    • http://xazabivi.epizy.com/sabeni.pdfIn PDF document text
    • http://vubefezit.rf.gd/bowstring_lake_fishing_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/firmenich_annual_report_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2241b9-cf8f-4b3e-abf1-d6af3f86e5e7/how_to_donate_clothes_to_charity_during_lockdown.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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 5652 bytes
SHA-256: 863f8f1a0bfefa95face3f25b246147fa32e5facb30181a1ed81eba02c18b525
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10936 bytes
SHA-256: 267894fafb5d93da05ed71ecf0dc7aa42e3f54e058aee62b5bb25ba26078297f

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