Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b115cae581c4cb6…

MALICIOUS

PDF

66.2 KB Created: 2021-02-28 19:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5435e07e5bd02a51aa1f16c272dbff91 SHA-1: 4acf975e04f58c245c5a5ae1e0016592c7d09aa2 SHA-256: 3b115cae581c4cb6eda310ddb992558b26219c2ffc05d9d0ed044149cec01546
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'ponafet.ru' and disguised as a Kindle user guide. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/123?utm_term=kindle+paperwhite+user%2527s+guide+2nd+edition PDF link annotation
    • https://nizerekudoni.weebly.com/uploads/1/3/5/3/135383630/3f6f8a34e.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/12_days_of_christmas_lyrics_printable.pdfIn PDF document text
    • http://zumufaxe.iblogger.org/fanorefibabujebetexudo.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/7220403.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/how_to_fix_alto_sax_octave_key.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/rhyming_dictionary_for_kids.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/5342970.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/ggAhakD/lixibikuvik.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/Vghjihe/banana_kong_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hUieJ16/the_walking_dead_our_world_apk.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/kegabasorotixosarivu.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/mijjitD/mokovorowuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ferogexomemu.rf.gd/55032326903.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/what_kind_of_battery_does_a_watch_use.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/how_to_remove_adt_panel_from_wall.pdfIn PDF document text
    • http://jowokepo.atwebpages.com/56812204442.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_off0000c898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC898 5448 bytes
SHA-256: 6dedca3a5b18aec0f9910f46a8edde279ef0c44ebf8cea1b3261a78efc29becf
font_01_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 9500 bytes
SHA-256: 858cb64e9d252b6cca308f0194af83defa40e501d26ca520b230417634570f87

Open this report in the interactive analyzer, or submit your own file for analysis.