Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad68a9ef4e6ecd1…

MALICIOUS

PDF

68.7 KB Created: 2021-01-18 16:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 369ffc44fcac432ee25b2e7809e0bb17 SHA-1: 727c0e07c86f296daf787264e4ac7f9e85a83143 SHA-256: 5ad68a9ef4e6ecd10d007eb6daade831129c3e9fbb42e84b092d938865fffd56
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one with a 'utm_term' parameter suggesting a tracked link, and a heuristic flagging it as a link farm on disposable hosting, points towards a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a download link.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=lyle+mcdonald+the+stubborn+fat+solution+pdf+download
    • https://site-1178794.mozfiles.com/files/1178794/google_maps_api_places_autocomplete_example_android.pdf
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f93df233aba0.pdf
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5fad2fc6e49bc.pdf
    • https://cdn.sqhk.co/tudakesovif/LPSggjj/wedding_salon_dress_up_makeover.pdf
    • https://cdn.sqhk.co/wemowubire/jdpoqid/49394995754.pdf
    • https://cdn.sqhk.co/litonesi/gglii0K/xasolafifufunevedalako.pdf
    • https://site-1244316.mozfiles.com/files/1244316/whatsapp_colorido_baixar_2018.pdf
    • https://static.s123-cdn-static.com/uploads/4376878/normal_5fca17d689dfc.pdf
    • https://site-1233507.mozfiles.com/files/1233507/91750953631.pdf
    • https://site-1166670.mozfiles.com/files/1166670/94626996155.pdf
    • https://site-1180367.mozfiles.com/files/1180367/stick_war_legacy_hack_3_mod_apk.pdf
    • https://site-1200561.mozfiles.com/files/1200561/smashing_the_battle_ps4.pdf
    • https://site-1168500.mozfiles.com/files/1168500/63161390126.pdf
    • https://site-1227540.mozfiles.com/files/1227540/49346729090.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/votuweroxigezog/elapsed_time_worksheets_year_2.pdf
    • https://s3.amazonaws.com/mamibis/asia_mcgowan_obituary.pdf
    • https://s3.amazonaws.com/forupokisip/65182233544.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1dc.bin
1a3c783d9929cdcbc4bb3986aa676afd7ffe7ba33631e12ed08cd3e300ff9211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 5552 bytes
font_01_sfnt_off0000d493.bin
1e35c1323515a01189a1b09dd5a8ae31db2860ad3bd81e136cfba0e221684d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 10164 bytes
font_02_sfnt_off0000f76c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 4324 bytes

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