Malicious PDF — malware analysis report

Static analysis result for SHA-256 490bc8aea259eec4…

MALICIOUS

PDF

87.6 KB Created: 2021-04-06 01:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8623e98631b62a3a5524adce02ca3998 SHA-1: 894014670de3259459483ad94b60044a5de9432e SHA-256: 490bc8aea259eec4d547a3fe04a78c1f8c5cf82284013822e74da6f57d336cfc
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/123?utm_term=photoshop+templates+for+invitations PDF link annotation
    • http://pumujavebedopa.iblogger.org/elmira_ny_weather_report.pdfIn PDF document text
    • https://cdn.sqhk.co/noxutuvixi/bRK0iib/80868458329.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/ggQ6jbz/zajosametusunobilek.pdfIn PDF document text
    • http://pewavari.22web.org/a_storm_of_swords_audiobook_cd.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/fQiihhd/custom_skin_creator_premium_unlocked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/gjghjet/jutow.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiziluda/Xu3geM6/connect_the_dots_free_printable_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/gihjbia/loxemeg.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/c3gfria/vin_diesel_iphone_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/ghK5Qjc/98462347263.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gulalebiton.epizy.com/centripetal_acceleration_derivation.pdfIn PDF document text
    • http://defozuwonig.rf.gd/samsung_galaxy_note_4_price_in_kenya_2017.pdfIn PDF document text
    • http://toxukanubevaga.rf.gd/largest_law_firms_in_nj.pdfIn PDF document text
    • http://serepuzokoz.epizy.com/does_usps_destroy_packages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5584e1c-7bfd-4f5f-9c6e-b996a3965185/8303596920.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_86d221f1c21443369970cbd47b8a24de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9326eadd-a3e6-4bf2-9833-611e859b26ae/geniveragosev.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_aedfa11a75d54c0da8a71e2c37038a35.pdf?index=trueIn PDF document text
    • http://javuxanasojajex.epizy.com/58904767388.pdfIn PDF document text
    • http://gojasogivizapip.epizy.com/sleeping_beauty_waltz_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ccfc24b-5cc7-49fa-8b1a-12e7029283f7/44639586601.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_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 4988 bytes
SHA-256: 82d39ba142c9928d98cc63efa2760ab62f4be53c9d344581ad66cfa9650775b2
font_01_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 10648 bytes
SHA-256: 8007c9fe737885e160d26b1d874a58eac2e7dc25bc47bf7b62977fa7d9519f9b
font_02_sfnt_off00014244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14244 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c