Malicious PDF — malware analysis report

Static analysis result for SHA-256 800fb1a2767242f8…

MALICIOUS

PDF

77.1 KB Created: 2021-03-29 19:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bd305dc40a00e067d03bc533fa42749 SHA-1: 82f712695d7d36086cf726c72c87f19ea2a43bc5 SHA-256: 800fb1a2767242f8aac93197fab29a72d1e9111c9a980d8fc14bdb88db6b4c02
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing lure or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=broadcom+ush+driver+windows+10
    • https://tisuzibe.weebly.com/uploads/1/3/1/3/131379312/b3c757faf6c33cd.pdf
    • https://rifivubego.weebly.com/uploads/1/3/1/4/131407021/d2492.pdf
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/ce0277.pdf
    • http://kolegutoravi.mygamesonline.org/84524719889.pdf
    • https://cdn.sqhk.co/vimewiki/jiFuv75/amazon_music_unlimited_echo_dot_deal.pdf
    • https://cdn.sqhk.co/nanubebebot/Dichjhd/safixoxoru.pdf
    • https://muduvikude.weebly.com/uploads/1/3/4/4/134483108/sepubawozenefudoz.pdf
    • http://nageramuvepom.mywebcommunity.org/gasupata.pdf
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdf
    • https://cdn.sqhk.co/senosekagoko/hfigSgf/pogojabolifik.pdf
    • https://cdn.sqhk.co/xesozugis/jjVihhe/vi_command_goto_end_of_line.pdf
    • http://sigisuzuk.getenjoyment.net/bedubusikureginux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kujafugakare.epizy.com/billboard_music_awards_2018_full_show.pdf
    • https://uploads.strikinglycdn.com/files/c647eed1-cebc-472c-be1d-c5593aafcf92/dusobiwemobunuwarekidazuv.pdf
    • https://uploads.strikinglycdn.com/files/5c220b96-62dd-424c-93da-67cce41023e7/how_to_make_an_appointment_to_take_your_permit_test.pdf
    • https://uploads.strikinglycdn.com/files/dd2ca626-e0d3-4d1a-ba3a-bc649afd0497/9765810589.pdf
    • https://uploads.strikinglycdn.com/files/6c9a39e5-32f4-4981-ab2f-50d3c478652c/how_to_add_film_to_polaroid.pdf
    • http://bememikat.onlinewebshop.net/phn_mm_chuyn_sang_nh.pdf
    • http://posewabenuxinot.epizy.com/68246895901.pdf
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_0c71dfd9165c4afeb5cd924530cbd6b5.pdf?index=true
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_abcc3037fe514859be1fa92e7c253ca3.pdf?index=true
    • http://legabukev.epizy.com/20335332075.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea6.bin
2dd2d4ae37e666e6e450e191b84b289b902af171df799b0306760296a21176c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 5540 bytes
font_01_sfnt_off0001016e.bin
dd465a8c03aacc9afe54639e4ae73eda94a8fbf00b27b6ccf045329183036438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 11584 bytes

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