Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc42c0d635006d7…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 15:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9627e4dd5c0d2e0064aa5a34504605ce SHA-1: a1529437a4a97fce78ca8aef4d843ec69a327199 SHA-256: 2fc42c0d635006d792c97841e30ba27c9aba138cfcab60e6a57773b37a788a1c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, likely to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://nipisod.ru/wix?keyword=similar+polygons+color+by+number+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/viwiratoposu/bgjBifZ/robezopegubadivajugazose.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/gjajgha/space_runtz_weed.pdfIn PDF document text
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/3f7cbed418.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/0Ojjxjd/dogarozunenewif.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/idd4rQw/janera.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/eNpAE8N/babowimefatepunuz.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/gGgejiN/gaming_wallpaper_for_walls.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/ihBjfjh/clouds_movie_real_life_story.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/judunos.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/QianSnQ/xumal.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/xikasereragi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_601078564880e.pdfIn PDF document text
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/libuneja.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/wipuni.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxigu/aThc03M/acdsee_free_key.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jcKFQN1/led_control_remote_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fd3dca363428.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/gomakobez/zurebenopesixaluw.pdfIn PDF document text
    • http://dozatajazen.rf.gd/65576940680.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/roraxaburorikedopu.pdfIn PDF document text
    • http://tevisub.rf.gd/gezedumepexodusulexiridib.pdfIn PDF document text
    • http://raxovasupu.rf.gd/ppap_manual_aiag.pdfIn PDF document text
    • http://fokuxukidedir.rf.gd/firefox_esr_linux.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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 5848 bytes
SHA-256: 3b0f227c34afbf622577b32bb18fe6600ce591d661d58fa637f41945eb1fa865
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 11492 bytes
SHA-256: 66c1f217fa3ac73f72aaa6384c0bb578c9cd14999df29df8f23bd80da3c1c2eb

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