Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dac23b29887519f…

MALICIOUS

PDF

74.9 KB Created: 2021-02-23 17:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 490940b27dd65eae0e6f6e22091328f9 SHA-1: dae302eb426f0b19707d6bb87e11f9b901bb8d84 SHA-256: 3dac23b29887519f042be906de1c4ba2c9efbff73f2bb4cd35e6ee2a5543805a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that redirect users to various websites, some of which are hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to drawing tutorials, likely to mask the true purpose of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/123?utm_term=how+to+draw+mountain+scenery+step+by+step PDF link annotation
    • https://kuvekimat.weebly.com/uploads/1/3/6/0/136052924/lozezaloroboze_dofemetinabolu.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/ieNHhg1/stack_the_states_game_for_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/jiAgigf/kazuko.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/bu5miif/70613781716.pdfIn PDF document text
    • http://vovidumuf.22web.org/fannie_mae_guidelines_second_home_down_payment.pdfIn PDF document text
    • https://cdn.sqhk.co/dexijonur/3jhWrrc/meralejewatefejad.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/chaNiej/44065517975.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/jNtijTb/mx_player_free_download_for_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/e9gdege/all_social_media_video_downloader_v6_nulled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubaporejolo.rf.gd/alliterative_performance_poetry.pdfIn PDF document text
    • http://lebubenopi.rf.gd/kiraxeleb.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/biografia_de_aristoteles_onassis.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/nafiwojutodewuje.pdfIn PDF document text
    • http://fibonudonug.epizy.com/autodesk_sketchbook_app_2018.pdfIn PDF document text
    • http://fozujapajus.epizy.com/alesis_dm10_mkii_pro_vs_strike_pro.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 5484 bytes
SHA-256: 39efa4908270d0a3f0a0fc75a8292f19a958eb435bb5543662fbddfb7ea8626e
font_01_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 10340 bytes
SHA-256: 06c6d551f5e012592863f8424e17f3b063c199619c4244c68689ce24cec0696b

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