Malicious PDF — malware analysis report

Static analysis result for SHA-256 d865cfee1843fbb0…

MALICIOUS

PDF

83.8 KB Created: 2021-03-28 15:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0088342aa35e50f440cfee72812c7050 SHA-1: 53f47cc6d1171d30a2e3752a265529cc5209567b SHA-256: d865cfee1843fbb0dd5553bc52e6010067d0630532710bcd0e4b73cd8e620c23
186 Risk Score

Malware Insights

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

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 0.9992

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=pathology+report+format+pdf PDF link annotation
    • http://policyhelpcenter.com/what_color_socks_do_you_wear_with_navy_pants_and_brown_shoespd8rn.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/2yiehcf/music_70_80_90s.pdfIn PDF document text
    • http://i-men.ru/what_is_mini_mental_examinationt3wma.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/creative_writing_workshop_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/igmlSBu/lovipavinezunabafafuzaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_60212339dc746.pdfIn PDF document text
    • http://opticsystem.website/fuzelefajelafulerunok2de7i.pdfIn PDF document text
    • http://narawodosure.medianewsonline.com/air_pollution_causes_and_control.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_600b8cfd23674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_605b693dbb50b.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/dnghhik/live_cricket_tv_match_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/ichiigw/auxs_safety_app_create_account.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/zq2KChg/the_walking_dead_game_iphone_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/gejikofoxaf/xF5hch3/silosu.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/saturn_bose_soundtouch_300_remote_samsung_tv_code.pdfIn PDF document text
    • https://cdn.sqhk.co/zanaforare/YOigifA/bahaddur_film_songs.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/60613070389d9o8x.pdfIn PDF document text
    • https://cdn.sqhk.co/vofepubot/chaZhhy/72412847783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigidafavubo.myartsonline.com/realism_and_naturalism_in_american_literature.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_7ebb371f989b48bdab9257136f467328.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_04c6941930ac4531b939c07393fb1a4f.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_f025e8c64b984aabbc3ffd1845ce756d.pdf?index=trueIn PDF document text
    • http://nitubak.atwebpages.com/81003029642.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 5380 bytes
SHA-256: b93df1aa3f4d6e0116fde2363c0824e0b87dbfcac6a98f9a060764586d0cc917
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 11124 bytes
SHA-256: 32f5c3a857bacb06d40358cb5b524e68da4cd59b8f5ad6c11bd43ff07bafa1c4
font_02_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 16980 bytes
SHA-256: 9be862625b8803e5d1fbdc2cdf9364eb15bc71fb8d4caaee9de10aef399e1e81