Malicious PDF — malware analysis report

Static analysis result for SHA-256 f626f592742d0d03…

MALICIOUS

PDF

69.4 KB Created: 2021-03-06 14:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 51bc32a15753aea16cd90db725573722 SHA-1: d477f55d624352c83c9dca5d31786b83589d786b SHA-256: f626f592742d0d0309c62fa70e1239c3d500a84d3326b9b35cc6830ce2286fbc
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=d%2526d+5e+dark+sun+setting PDF link annotation
    • https://cdn.sqhk.co/wibafozadil/cgcIu2Q/power_bass_subs_review.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/how_do_i_get_property_lines_on_google_earth.pdfIn PDF document text
    • http://kilewigi.iblogger.org/us_news_world_report_law_firm_rankings.pdfIn PDF document text
    • http://mobile-media.moscow/where_to_buy_metal_detectors_in_australia64jxm.pdfIn PDF document text
    • https://cdn.sqhk.co/nemovofa/hwVkheT/jozeg.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/gxyiizh/retro_world_llc.pdfIn PDF document text
    • http://uose.xyz/briggs_and_stratton_18hp_opposed_twin_performance_partsbrjaa.pdfIn PDF document text
    • http://karaulovlife.site/dell_c1765nfw_fuser9amow.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/what_are_the_books_in_the_fantastic_beasts_series.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/05Wgjje/little_heroes_pediatric_dentistry_mission.pdfIn PDF document text
    • http://jegepev.22web.org/aifmd_level_2_regulation.pdfIn PDF document text
    • http://xaxikobovivo.22web.org/99103460758.pdfIn PDF document text
    • http://francobusiness.com/dengue_guidelines_cdcye58m.pdfIn PDF document text
    • http://legendnat.space/sozuligusosozv5g1l.pdfIn PDF document text
    • http://ttop-shop.com/baaghi_2016_full_movieu2hzh.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/merakafomim.pdfIn PDF document text
    • http://choosemadam.site/lozapalewozolektm4w9.pdfIn PDF document text
    • http://thedopemarketing.com/topobexobijuzulevuxisevopl1c.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/how_to_remove_clutch_on_homelite_chainsaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jonesojawu.myartsonline.com/how_does_automatic_bread_maker_work.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_897b7a2b24d9470e869a06b018da35ff.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_dca8a1e3e04a44d8af61be86b29b0c9c.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_39ef21135fbb452ea24a038ce6c8b0ae.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_debb958782cd4d5b8bf5aac8f5d45b07.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_ffaa825447144cd5b141a9dbe214f179.pdf?index=trueIn 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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 4156 bytes
SHA-256: 7b9a78bc71d00e4bcff8473d51fc82c270a18144a13d22e5cfd906eda86eaada
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 9868 bytes
SHA-256: a481b2f810b61dd22bb9fdf2f868981f4e8d8d56cbe9178c6e42b8c6d801aea6