Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2e5a0bfe6f0715…

MALICIOUS

PDF

76.8 KB Created: 2021-06-10 07:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5744f7c79f63b16d5927ff3db881de5 SHA-1: cfb72d223289413a1f75d1802f5c41ef0ffbae16 SHA-256: 1f2e5a0bfe6f0715cc200ecbc74101e507822f5777016a7461b93bdd2284b942
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-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://infrive.ru/pbw?utm_term=ppsspp+100+best+games PDF link annotation
    • https://pegalidaxib.weebly.com/uploads/1/3/4/6/134632492/8843183.pdfIn PDF document text
    • https://wufavupo.weebly.com/uploads/1/3/4/3/134319323/kegodiluxepe_daxasitazob.pdfIn PDF document text
    • https://gafanobekifin.weebly.com/uploads/1/3/4/7/134768645/9914945.pdfIn PDF document text
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/lanuxanukejaxo-viruforodokaper.pdfIn PDF document text
    • https://dajikapepexav.weebly.com/uploads/1/3/4/5/134597014/wepuximojepikatas.pdfIn PDF document text
    • https://bomusega.weebly.com/uploads/1/3/4/6/134656079/5215073.pdfIn PDF document text
    • https://zozasegabaf.weebly.com/uploads/1/3/4/3/134354173/2110495d6.pdfIn PDF document text
    • https://xolitosoxi.weebly.com/uploads/1/3/4/5/134583661/a78b2aba61.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/4b60c5de-f171-4aa5-967c-a016bf72b85b/hl-l2360dw_toner_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbbbbd6-7176-493c-833d-39b008bd05f7/why_is_tcp_ip_better_than_osi.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/w/file/fetch/144527157/benim_hocam_paragraf_soru_bankas.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144536964/what_grills_are_comparable_to_weber.pdfIn PDF document text
    • http://pewamez.pbworks.com/w/file/fetch/145021929/cheat_zynga_poker_android.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/27452890626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b0ba6f-6aa6-4aab-9e08-bdaa1c7b8d34/nukozoxivixat.pdfIn PDF document text
    • http://muxopal.pbworks.com/f/foreign_words_used_in_english_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec67ec6-13c5-42cf-a387-6652177f8736/multiplying_rational_numbers_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b246de1e-ed88-495f-94b1-f330542c04bf/can_you_use_a_wired_xbox_360_controller_on_switch.pdfIn PDF document text
    • http://fisagibop.pbworks.com/w/file/fetch/144938199/bijusonibevegamiwotuvosez.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/english_to_urdu_spoken_books_free_download.pdfIn PDF document text
    • http://wepoline.pbworks.com/f/how_pollution_affects_aquatic_life.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/60929617948.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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 5348 bytes
SHA-256: 7b980641858b496e01f3fbe97d5c538fe5d65f22ba86657c6e643ead5a062ddd
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 10928 bytes
SHA-256: 3695889af6a3c0b98234b757bf6e42ef346d602fec3a26f9e328399a2871a0a8