Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8104250b1a94e0f…

MALICIOUS

PDF

72.0 KB Created: 2021-03-09 00:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bfc928ab7981d245a2604aa4df4fd37f SHA-1: 3684dce196b90e117efc57704ea19748918cca1d SHA-256: f8104250b1a94e0f4f68d2429f40501f4798b3865fa27a5ff1b0cd682e4f8e4b
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text that may be part of a lure, and the presence of numerous links suggests an attempt to direct the user to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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
  • 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=blessed+assurance+free+pdf In PDF document text
    • http://talubadev.iblogger.org/gexiruvefazozino.pdfIn PDF document text
    • http://mesretly.xyz/warhammer_40k_kill_team_elitescanxs.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/air_pollution_ppt_free.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/wipusafax.pdfIn PDF document text
    • http://italy50wow.pro/how_much_do_pearson_access_codes_costi6461.pdfIn PDF document text
    • http://fukoramilani.22web.org/mamiya_rb67_pro_s_prism_finder.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/whirlpool_fridge_repair_man.pdfIn PDF document text
    • http://prequester.online/how_to_draw_a_open_book_easy_stepses9x8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://serefelotu.epizy.com/omron_10_series_bp785_vs_bp786.pdfIn PDF document text
    • http://nokezipaxizowox.epizy.com/nanonegiwusozewa.pdfIn PDF document text
    • http://nonosolagosev.epizy.com/zemitaxeb.pdfIn PDF document text
    • http://todakule.rf.gd/89351600005.pdfIn PDF document text
    • http://kagiweluxipo.epizy.com/causal_attribution_theory.pdfIn PDF document text
    • http://luderaguzafa.epizy.com/jilewagizapopotozuf.pdfIn PDF document text
    • http://birofasadonu.epizy.com/cat_dog_beautiful_images.pdfIn PDF document text
    • http://bixogonabu.epizy.com/light_chain_amyloidosis_guidelines.pdfIn PDF document text
    • http://kevusej.epizy.com/6751960206.pdfIn PDF document text
    • http://lubesakitulifo.epizy.com/nizabinideloviwivaget.pdfIn PDF document text
    • http://bakotisimipivok.rf.gd/ptcb_practice_test_study_guide.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/cuatro_formas_de_comunicacion_linguistica.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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 5200 bytes
SHA-256: 584fc1ab724d46c0d5b2ce17b31668e2d500d0eaad3d7f22ff8bef0d941a9749
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10296 bytes
SHA-256: 714643d631553140e88fdc0c2f7532f2656972165ae116bcebf8cdb7a2c76f9f

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