Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd65fdea865c92e5…

MALICIOUS

PDF

80.0 KB Created: 2021-03-05 07:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1026b6f419bd952b447aa74a5067aefd SHA-1: 2a8414d5a504e3b227278841da525d6fa1c5e002 SHA-256: bd65fdea865c92e58384423e2e2a7b82e90d80799a9b18576a3c65f00184d782
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm hosted on disposable domains. This is strongly indicative of SEO poisoning or a phishing campaign. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://soxebez.ru/123?utm_term=fallout+4+energy+weapon+mods+xbox+one
    • http://ecosbor.net/544596473546z6wh.pdf
    • http://kernig.online/hayward_pool_heat_pump_error_codesacbou.pdf
    • http://daliadiago.com/gifubujetugigajinuxafx9at.pdf
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/5355215.pdf
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/28bde354caeb23.pdf
    • http://wiinorama.website/sword_art_online_progressive_7_release_datepmp1f.pdf
    • http://zuvinesewuwiz.iblogger.org/adolf_hitler_biography.pdf
    • http://pl50off.info/kuginorogutrsqfl.pdf
    • http://lotto-investclub.com/stiletto_nails_short_pinklu5pk.pdf
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/suragamivunevafugep.pdf
    • https://difidewuwigexej.weebly.com/uploads/1/3/4/6/134652805/juxupib_getapunedufepim_bolexomepe.pdf
    • http://devlp.design/tuff_stuff_9500_winch_reviewnncqj.pdf
    • http://zotokes.iblogger.org/oxford_dictionary_app_download_english_to_urdu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/686666b8-a850-4674-81b3-cf72dcf68131/duwelapokasomoruv.pdf
    • https://uploads.strikinglycdn.com/files/f5f79595-0838-4e15-bc3b-445813871276/38534051592.pdf
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_e34cd34d593a40ddb6a250184bbcf3b3.pdf?index=true
    • http://lebodevafetag.epizy.com/delegation_process_in_an_organization.pdf
    • http://dubaduvuk.rf.gd/bleacher_report_wwe_crown_jewel_results.pdf
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_3af399790d294dec83f3e8f71bc94b6e.pdf?index=true
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_df6e0d8bc3b24f1d82f3d2fed37f9f4a.pdf?index=true
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_c0d0e44dd4b94293b436a12e48ca8415.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5e.bin
e4426dd4b383d405bf418d958864b37941b69727daba2833da502c5460ff451a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 5724 bytes
font_01_sfnt_off00010ee7.bin
3d328f22a729e64d37a442822e6824b9862329f8edce421de234bd2f61ced598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 10444 bytes

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