Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa21aeb82de307af…

MALICIOUS

PDF

78.0 KB Created: 2021-04-01 09:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ac91578b18c054562a4e705d9155ba5 SHA-1: 5e9ebd3212b35277c53c5c62277216191dc24cb7 SHA-256: fa21aeb82de307af9544e43e251de364ab1a1050beacded38d40f4e6c843df83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/award?keyword=mastering+metrics+angrist+pdf PDF link annotation
    • https://cdn.sqhk.co/jogepirar/bcjUJjf/offroad_snow_bike_motocross_racing_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_605d843665ba3.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/VVjaghJ/my_talking_hank_mod_apk_rexdl.pdfIn PDF document text
    • http://xemopubuga.iblogger.org/basic_event_planner_contract_template.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/difigKI/wwe_payback_rumors_2020.pdfIn PDF document text
    • http://bovakepixoworax.iblogger.org/jojedo.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/Ogdjihi/must_watch_movies_series_of_all_time.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/VTJwN3O/webamujesuro.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/92156602110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484107/normal_603c18b11864b.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/farojapulawedokivo.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/7277882362.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/settling_the_northern_colonies_true_or_false.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugomodag.atwebpages.com/16740443781.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/lituminuduretesamategafag.pdfIn PDF document text
    • http://piwufamudadavo.rf.gd/cavalcadepublishing.com_practicing_equation_balancing.pdfIn PDF document text
    • http://pogojufizos.rf.gd/xevezekekiw.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/lemusisigadod.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/android_sdk_path_mac.pdfIn PDF document text
    • http://merizipu.rf.gd/images_of_sad_girl_sitting_alone.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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 5448 bytes
SHA-256: edeebd427403600f38c5d2e81de97130d6f740380c40bba3761120a271f1477e
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 11036 bytes
SHA-256: a15adcc242c45dbc7688e7ed9822e1addad439fa8b266239139d108c20038cdc

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