Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b3da7b3d345977…

MALICIOUS

PDF

73.3 KB Created: 2021-06-12 12:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7543001fffaf1854e7e7617720b96837 SHA-1: ceebaffe1735ade212739c0f721ce0fd93a1c8c1 SHA-256: d1b3da7b3d3459776208fd0c12125a8100da635851146cba257eca67fb6fbc6f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of external URIs like 'https://infrive.ru/pbw?utm_term=blocs+wave+android' further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://infrive.ru/pbw?utm_term=blocs+wave+android PDF link annotation
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/4803271.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/rilosovigepizoj.pdfIn PDF document text
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/2f31e.pdfIn PDF document text
    • https://xelavizagak.weebly.com/uploads/1/3/5/3/135325118/tuwig-nejuvas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482027/normal_5ff28643cdc9c.pdfIn PDF document text
    • https://tegikalom.weebly.com/uploads/1/3/0/8/130874380/welixewabeb.pdfIn PDF document text
    • https://negalunuz.weebly.com/uploads/1/3/4/7/134702004/5454099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_602cf2ec25c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_60217e6749640.pdfIn PDF document text
    • https://kirurivujet.weebly.com/uploads/1/3/1/4/131437430/toteberonezulal_kixaka_suwapegegudepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5fc80af14584a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabumur.pbworks.com/f/fortnite_tracker_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a650d5e4-f913-4c4e-ada8-f30f556a9701/52493655350.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/w/file/fetch/144678558/html_programming_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878d40df-1922-46f5-ab49-963c3047452e/windows_7_arabic_language_pack_download_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddff60c-a9b4-4fb4-9e24-1657cf88f556/how_to_become_a_pr_professional.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/w/file/fetch/145107837/16_line_quran_with_color_tajweed_download.pdfIn PDF document text
    • http://likanegi.pbworks.com/w/file/fetch/144501873/fijig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7137789f-e467-4c0b-85b8-795ba5c198b6/norton_anthology_of_american_literature_table_of_contents.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144662946/1156000354.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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 5136 bytes
SHA-256: 6fc1f3e4e0d5f2181f459f56e04b7bdec43cb478f438fc4f28a6d9557e69f218
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10444 bytes
SHA-256: acc9883ceaf5f7bff91a63788d9af8574e7cff8cdfb8d435de838404fbada39f

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