Malicious PDF — malware analysis report

Static analysis result for SHA-256 116d2a4a204f10bb…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 17:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88d68833f55e09da9d871dc3059d1aa SHA-1: eea9c88be28c75b68c17e0b809e110a842ef9660 SHA-256: 116d2a4a204f10bbecd96264eaa7b4dd38ad03ab8e451174a0f403fb31a1efe5
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. Heuristics indicate it's a phishing lure and potentially a password-protected archive handoff, designed to bypass gateway scanning. ClamAV also detected it as a phishing trojan. The embedded URLs likely lead to further malicious content or credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://jacksth.ru/award?keyword=data+analytics+made+accessible+2020+pdf
    • http://blog-millionaire.buzz/36754304153le5za.pdf
    • http://homeolimp.com/whats_the_famous_line_from_the_shiningqycz6.pdf
    • http://zavodtriumf.com/528114270810oz5p.pdf
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/porafi.pdf
    • http://ita-fitness.fun/31435128636qinem.pdf
    • http://winclean-shop.space/quran_in_telugu_with_arabic_pronunciation_free_downloadi96wv.pdf
    • http://unityfree.xyz/create_alert_box_in_androidpsda1.pdf
    • https://tijisifexabid.weebly.com/uploads/1/3/1/0/131070771/484368.pdf
    • http://community-day.ru/napopisorerokavql7m.pdf
    • https://reluxepeguru.weebly.com/uploads/1/3/4/3/134363030/kapagovijojejerokuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jobavo/alcatel_idol_4s_android_update.pdf
    • https://s3.amazonaws.com/vefagotoje/jetufawe.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/intercessory_prayer_points_for_the_sick.pdf
    • https://s3.amazonaws.com/tosevud/cheppave_chirugali_movie_all_songs.pdf
    • https://s3.amazonaws.com/mogipegi/85715141473.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/lubem.pdf
    • https://s3.amazonaws.com/zamemigojat/giduvoxolilukedome.pdf
    • http://mixonanax.epizy.com/quality_assurance_plan_template_manufacturing.pdf
    • https://s3.amazonaws.com/sivanira/likert_survey_template.pdf
    • http://zepedijuva.epizy.com/thirsty_crow_story_in_english_free_download.pdf
    • http://zapiwolatuw.rf.gd/40137658935.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/video_cutter_app_uptodown.pdf
    • http://vezoxonu.epizy.com/53455969249.pdf
    • 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_off0000e897.bin
a010e8be3d919cc9864499a93f6ea3e408054de53825ccade41cbbaa99c6a352		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 5720 bytes
font_01_sfnt_off0000fc09.bin
f998e4788ba1bcd1632cd9027c246412e71c44fa9c25cde790db467da6fa3f07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10676 bytes

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