Malicious PDF — malware analysis report

Static analysis result for SHA-256 80743a49a244b35f…

MALICIOUS

PDF

77.0 KB Created: 2021-02-27 19:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e4782235432ecd405371cd3323ee99aa SHA-1: 75d9c2f5b8feff0e813cfcf2a307f1fffaa7b6f6 SHA-256: 80743a49a244b35fc47e36d82d88fa1e15676ad30c4d1ece8a4f242eea5567fb
184 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and redirecting to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=best+wrist+blood+pressure+monitor+consumer+reports In PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/woriga_waxetef_vufolinezola.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/gjYjggd/busipalejupoxedugomikut.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/90468197158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_5fe7f4de7077f.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/palej.pdfIn PDF document text
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/1928afac18e81e.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/nizune.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gTxoIqb/15780473737.pdfIn PDF document text
    • http://dikebar.22web.org/how_to_set_immersion_heater_timer.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/hfhfjeC/rebilaxakorivapafoker.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/dIygiZr/photo_editing_tool_mac_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_601f9afa7b064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nalakakowim.epizy.com/b._d._o_of_full_form.pdfIn PDF document text
    • http://naxokagad.epizy.com/15582990237.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/emulator_android_paling_ringan_kaskus.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/jijipewav.pdfIn PDF document text
    • http://depevabevidot.rf.gd/here_i_am_lord_piano_sheet_music_easy.pdfIn PDF document text
    • http://lavavoju.rf.gd/game_of_thrones_winter_is_coming_android.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_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 5288 bytes
SHA-256: 1a2def9605beaf07b177e1e8f81381ab565f26cf668500d7740cec755dda15b8
font_01_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 10332 bytes
SHA-256: b8487bda9ccaa966f890ae5c15dd0c8183e81d6f6b602039b1a17874585cffec

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