Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d4e612739ba20a…

MALICIOUS

PDF

79.4 KB Created: 2021-03-24 23:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1b582ced2ecc9842c2561b4c73aa9d96 SHA-1: 565b2bea26c8a68ff4e34335120fffcbc37f23fb SHA-256: f2d4e612739ba20ad961cc9aafd0c1f436e262ae8882cb98493d8bf4d6012675
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 0.9998

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://crophysi.ru/wix?keyword=fashion+zeitgeist+pdf PDF link annotation
    • https://cdn.sqhk.co/kavuluxaja/gibEuwn/carx_drift_racing_hack_mod_apk_download.pdfIn PDF document text
    • http://nature-ital.space/family_definition_sociologyh9r6h.pdfIn PDF document text
    • http://mgacessoria.online/how_to_make_a_climbing_training_planrdbz9.pdfIn PDF document text
    • http://lorenbayi.com/5624881637619qdi.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/eibheif/the_sims_freeplay_cheats_2020_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/bEFjhjb/79928099793.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/iahaggp/landscape_coloring_book_color_by_number.pdfIn PDF document text
    • https://cdn.sqhk.co/vigibizez/IidVmL6/44161247093.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/hdAijpy/android_master_detail_flow_fragment.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/iije8ij/tap_builders_warehouse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6815131-39ab-403d-9e8e-c63e370ede4f/how_to_connect_my_hp_deskjet_2700_printer_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1560337a-ba71-437a-9900-4b672f08189b/what_is_considered_a_voided_check.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_24257dd667d546e4bda473d31b4f5ca0.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_959c0a50d2d444869b7e3de49839e252.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecaaad8c-83c0-4acc-9a3a-05e50fa3c652/kolijevalepazaju.pdfIn PDF document text
    • http://tivupomemotet.rf.gd/interjections_worksheet_with_answers.pdfIn PDF document text
    • http://nekipusixewid.epizy.com/messenger_cho_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f7e2e2-0878-4f29-beac-4f1bb53d676c/the_magicians_season_4_episode_10_imdb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 5180 bytes
SHA-256: f5984c20101a8de1cd60e472872ae36219d9c47ab3dff0bfce04d7a5a2af5e9e
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_02_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 11336 bytes
SHA-256: 5c0da155f0bba4304882875032e5b31d20bf3476336aab9cb49752f77a0515bd