Malicious PDF — malware analysis report

Static analysis result for SHA-256 1730877fca993ba6…

MALICIOUS

PDF

80.6 KB Created: 2021-03-15 01:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1c0ba1a5956c68383b979d3ff8c01f23 SHA-1: e9d7d509c004fe8e34e3b88113a5d7daf14d727a SHA-256: 1730877fca993ba6066c65a348c683d0724c7b63e34923802ba81087679099da
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 0.9997

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://maypoin.ru/strik?utm_term=how+to+find+alpha+and+beta+in+excel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385230/normal_603cb855b3071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5fd0bb67e4a7c.pdfIn PDF document text
    • http://newyearshop.site/what_are_four_nitrogen_bases_in_dnabywy4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451566/normal_5fef17f800551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fcbe0656f0cb.pdfIn PDF document text
    • http://kleomaften.online/honda_accord_3._5_v6h5m40.pdfIn PDF document text
    • http://fonixeguga.mywebcommunity.org/grade_4_math_worksheets_free_download.pdfIn PDF document text
    • http://purubifo.medianewsonline.com/gifegisugeb.pdfIn PDF document text
    • http://gaydating.world/raymarine_c120_manuale_italiano107ta.pdfIn PDF document text
    • http://livecopyrightverification.com/8494185135bd3e3.pdfIn PDF document text
    • http://floradoma.net/car_racing_games_for_android_phoneg6k3f.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/star_trek_discovery_season_3_episode_6_review_ign9oyew.pdfIn PDF document text
    • http://cetop.xyz/37671447315uizsd.pdfIn PDF document text
    • http://xidegesadevelu.iblogger.org/viwekavofal.pdfIn PDF document text
    • http://vewedomodisex.22web.org/74846738155.pdfIn PDF document text
    • http://toportt.online/naming_esters_worksheetfs0pk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimozan.epizy.com/tefarixifejoninizor.pdfIn PDF document text
    • http://vovajixavago.epizy.com/james_blunt_monsters_piano_sheet_music.pdfIn PDF document text
    • http://kitijowu.rf.gd/ncert_maths_textbook_for_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/spigen_rugged_armor_moto_g6_plus_case.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/street_fighter_animated_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/cell_211_imdb_parents_guide.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_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 5232 bytes
SHA-256: ef79d0a7148eeead8966796da5125f6391b80652b33f21aea0a62b1563a926bc
font_01_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 11276 bytes
SHA-256: 21f4f42b27ca5695d08327806e33995d5812f6dabb815910a7da812ee050d24d

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