Malicious PDF — malware analysis report

Static analysis result for SHA-256 debaca490db20b24…

MALICIOUS

PDF

107.9 KB Created: 2021-02-20 02:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6f842bc65cd90154e29b123978005e45 SHA-1: 80227b4fc681f66461ca2a9d27bbab71fc43d8d3 SHA-256: debaca490db20b24a0bdf53382095b692a6898439081ccb645d144957d3aa5e0
126 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 high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Thermodynamics for dummies'. Numerous external URLs are embedded, with one specifically pointing to 'jacksth.ru', likely serving as a redirection to a malicious site. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=thermodynamics+for+dummies+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473052/normal_5fce8cb2904fe.pdfIn PDF document text
    • http://islemleriniz.org/ccna_for_dummies_2019r5mjy.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/gdxSwhh/fun_run_3d_multiplayer_apk.pdfIn PDF document text
    • http://899themes-demo.ru/rinixoxatolowavapifnm5nt.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/kNgehfb/zibejika.pdfIn PDF document text
    • http://mesretly.xyz/fapaferiki095u4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fe81f8d8e79c.pdfIn PDF document text
    • http://flash-sar.online/ballarat_art_gallery_annual_reportl0ok1.pdfIn PDF document text
    • http://cosmicgig.com/made_in_china_2025_reportgb1sk.pdfIn PDF document text
    • http://trokot-shtorki.online/dyson_dc50_replacement_cleaner_head22rat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_601e051f772f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489716/normal_6014b7d89fea8.pdfIn PDF document text
    • http://madamzero.com/yahoo_weather_forecast_rawalpindig4agh.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/idgexb0/lock_screen_black_wallpaper_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_60090c2fe9497.pdfIn PDF document text
    • http://idealica-it.website/29209561901c3ztd.pdfIn PDF document text
    • http://bestrongbyg.com/coraline_hd_online_dublado6lc5g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377936/normal_5ffd4514d6a1b.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/regufojalojaza/58271424358.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_off00016b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B83 5280 bytes
SHA-256: c4d9adfcf66b38ec07d174577e61f18c8cdae5454f9c48a515d726a6761a2611
font_01_sfnt_off00017d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D51 10812 bytes
SHA-256: 4e2fead2164d812769d70e582b771cd3968477779d1b0f3f03e09a5fdef17188

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