Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ca77cf30ccf0e0…

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 20:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b4bb9549a0fbc3abc1798fb8d9c63cb9 SHA-1: 5ac592c32aae4137017c88ef044ad1fb43bedaaa SHA-256: d9ca77cf30ccf0e06aa1bb6df9c070cf77c8b6ffc6ad7dd8740a1989046659e0
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 0.9996

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=cfp+practice+exam+pdf PDF link annotation
    • http://famozosivupiwij.sportsontheweb.net/12_cuentos_peregrinos_resumen_de_cada_uno.pdfIn PDF document text
    • https://cdn.sqhk.co/xusezasaj/gjfjjhi/vuzujoku.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/WUHDmPB/master_of_relief_carving_and_sculpture.pdfIn PDF document text
    • https://cdn.sqhk.co/romemanir/jgjnrJ3/scrabble_word_finder_with_letters.pdfIn PDF document text
    • http://opssmall.space/blind_2007_movie1j5r2.pdfIn PDF document text
    • http://retamos.mygamesonline.org/zufasadirapolalidig.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/98168514955owdwo.pdfIn PDF document text
    • https://cdn.sqhk.co/sexifirume/ujejfgh/6272537799.pdfIn PDF document text
    • http://italiahot.fun/refededglno.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/hciggi1/sort_n_fill_game_app.pdfIn PDF document text
    • http://bt-management.website/sukarzynyd.pdfIn PDF document text
    • http://weraka.online/chinese_olympic_weightlifting_bookqf54n.pdfIn PDF document text
    • http://abzac.me/nedotemukodca0or.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/9gegchh/41116604294.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/aOjhiiC/sach_36_k_binh_phap_ton_t.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/77216a50-004a-46ac-8c4e-f58723868e1b/why_netgear_wireless_is_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202b427b-7478-4b1e-91d7-04e57e47edfd/2677492441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef45600-b243-48bc-aa58-e52df2f01692/samsung_rf4287hars_xaa_ice_maker_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13e28e4-c3ba-40e5-926b-c2a48d14a4c6/who_guidelines_for_baby_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e0c739-7400-4162-88b8-97a1f2fbbadd/msi_gtx_970_4gd5t_oc_review.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/49797841399.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_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 5064 bytes
SHA-256: 249f74430fa3b1b4950a82910ce3ce2802a00abd407120c791240ee4d8d29041
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 11656 bytes
SHA-256: 77e1d1250714afceb8d2e2e42badbccefc32eb6e3d8fc9cd4bc83cacf824c4f9

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