Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e93926d6172acf0…

MALICIOUS

PDF

88.7 KB Created: 2021-01-24 11:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 03c4612f36c0a1206fce75f54cff36c8 SHA-1: d421790e26c5f1d13102b047fbc3008b273c3cc9 SHA-256: 5e93926d6172acf07ca5ce0cb236b305aa31a4b898b5f592f8937019fa083bda
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a 'Boy scout communications merit badge worksheet'. The presence of numerous external URLs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or redirection campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seumenha.ru/aws?utm_term=boy+scout+communications+merit+badge+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465537/normal_600c6e8cd58d8.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/hdTTzaF/wild_panther_sim_3d_apk_android_oyun_club.pdfIn PDF document text
    • http://like-store.site/shooter_arcade_games_online9le11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_5fc9163e9ca5b.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwobevina/WVijOig/the_lawless_one_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/tHMnOhe/todolist_abstractspoon_theme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_5fe9379768082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375342/normal_5fe186afc5500.pdfIn PDF document text
    • https://cdn.sqhk.co/kigudukolon/ghg8ife/tewudipidubovesur.pdfIn PDF document text
    • http://nanolenka.xyz/10007898825lzuks.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/hhdAewd/turbo_card_login_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/bBagfEV/22333870710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5fdd3e484d1cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530712/normal_5fe7a16b02149.pdfIn PDF document text
    • http://esclub.pro/stickman_dismounting_mod_apk_download_freeksx3v.pdfIn PDF document text
    • https://cdn.sqhk.co/ripudilibizo/WTghhE8/vipofugawokitavolilan.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/dUhihjr/superhero_mobile_ringtone_download_2019.pdfIn PDF document text
    • http://fastpysystem.online/pemobuzizugapewekh0qq8.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/niporofez/bijective_combinatorics.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/bepojujakoviloku.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/64347356923.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/skript_bilanzanalyse.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 5768 bytes
SHA-256: 40177b345381aa32faeb647559b7fdca948fcc7eff8e1c73c91247bd3a1054f9
font_01_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 10220 bytes
SHA-256: f9f25f1773ec0f7ff7aded8e45d6b0710b2dc964cf038aaa4566bf7690387165