Malicious PDF — malware analysis report

Static analysis result for SHA-256 8899e6a95216ae67…

MALICIOUS

PDF

73.8 KB Created: 2021-03-27 22:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 79d0815a43acc05cbb5a0de6eb8eefbe SHA-1: 2fdb8396d862925fe78d11569d60e50ff4f635d7 SHA-256: 8899e6a95216ae67fb4c254aedc82106751b5bc061dcb6b5086b051e4f2f81df
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirectors and 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 links are indicative of a malicious redirector pattern, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/award?keyword=hepatitis+c+treatment+guidelines+pdf In PDF document text
    • http://vannabanyavsedela.xyz/mitogozgfnh3.pdfIn PDF document text
    • http://sozetil.66ghz.com/92221299651.pdfIn PDF document text
    • http://fabermanufacture.ru/punjabi_boliyan_lyricsgtsih.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/jJRVjss/garden_answers_plant_identifier_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxebiseso/0ibihid/jazezejo.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/ojciage/lightroom_cc_app_download_for_android.pdfIn PDF document text
    • http://quickpapp.online/the_looking_glass_wars_part_2_summaryocurd.pdfIn PDF document text
    • https://cdn.sqhk.co/xapewiwud/ifjcVhe/racing_go_kart_wheels_and_tires_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/ihghlge/batman_arkham_city_dlc_ps3.pdfIn PDF document text
    • http://instofficial.online/washington_dc_weather_today_at_noonhst3e.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/SiizS6m/gebumodogajuripoj.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/gpEichc/tevotas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/alkene_formation_oxidation.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/winidatodorojelekanazav.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/polasa.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/radhe_radhe_chale_aayenge_bihari_ringtone.pdfIn PDF document text
    • http://rarefovukafulu.rf.gd/wasekobodadinotu.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/3534434076.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/vekimigitexibomagiji.pdfIn PDF document text
    • http://dabizoxirodili.rf.gd/96755547476.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_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 5436 bytes
SHA-256: 3f2d350c16e12a443cd878cc18acdbfb039cdabd3717e3d2e336beee27304f75
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 10816 bytes
SHA-256: dec5e61319c67a290d9723ff192743c5c5df5671ee79a132567d59f93c50c363

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