Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db42591fbef2e8f…

MALICIOUS

PDF

71.7 KB Created: 2021-02-21 05:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4f05a9fdc65affb32f91adaa4e25c12f SHA-1: ac7366177925c0317d420ccc52e4480520e0caaf SHA-256: 7db42591fbef2e8fcbefb73f44f26317671c21fc1ed227377d17234c419c0199
244 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded URLs, many of which are hosted on disposable domains and point to redirectors. This behavior is characteristic of phishing or malware distribution campaigns, aiming to lure users to malicious sites. The ClamAV detection and ML classifier further support the malicious nature of this file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=christian+decrees+and+declarations In PDF document text
    • http://idealsit.fun/72008349406v3703.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/hNjc8hj/23902901791.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ujiZohi/ea_sports_ufc_3_roster_list.pdfIn PDF document text
    • http://prod-fruit.space/chunkzz_malayalam_songs_freewnrm9.pdfIn PDF document text
    • https://cdn.sqhk.co/satofapo/cicjeha/u_dictionary_app_for_pc.pdfIn PDF document text
    • http://mebelintera.ru/252376282689mby0.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/xhhxrut/59342246423.pdfIn PDF document text
    • https://cdn.sqhk.co/nazalugewu/BIehiie/25209165487.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/jiIygf0/recargas_claro_el_salvador_gratis.pdfIn PDF document text
    • http://dressnbuy.com/vocabulary_workshop_level_e_answers_unit_1-3zcvdh.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/VgeQTig/best_escape_game_520_saltwater_crocodile_rescue_team.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/5336051.pdfIn PDF document text
    • http://nutristrike-shop.ru/52913253439j7p2f.pdfIn PDF document text
    • http://todayshop.website/blank_character_sheet_deviantartgep22.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/vQijgcO/health_and_nutrition_degree_online.pdfIn PDF document text
    • http://natorg.fun/fanine81yvt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_600e52664932f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 4932 bytes
SHA-256: 57133f4c2314d2d96129a1b1db1b1514b474fb183aebc34de98312ce3a0093a9
font_01_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 9556 bytes
SHA-256: d9ab6248715ac58d5fb9d97e26cc83282e605cb4cc1beaea55b343fd2e44c1af

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