Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb7031ae4773402…

MALICIOUS

PDF

79.6 KB Created: 2021-01-20 07:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9a72c41d39d79be99792ff6cb334e388 SHA-1: 2751f2510e608c06b93b7ce153c768506c373f2f SHA-256: 9fb7031ae47734020c1725dcbb432affda001a80c7fa4e2fe0c3aa09824b8e48
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to popular games and software, suggesting a lure for phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://ggtraff.ru/123?utm_term=game+of+thrones+conquest+mod+apk+android+1 In PDF document text
    • https://site-1168150.mozfiles.com/files/1168150/cubic_dance_switch_colorado.pdfIn PDF document text
    • https://site-1195484.mozfiles.com/files/1195484/appsc_group_2_new_syllabus.pdfIn PDF document text
    • https://site-1168172.mozfiles.com/files/1168172/45598687298.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/hePgfig/monster_shooter_2_android.pdfIn PDF document text
    • https://site-1258757.mozfiles.com/files/1258757/free_debt_snowball_calculator_excel_spreadsheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5fbf5152b3de0.pdfIn PDF document text
    • https://site-1172732.mozfiles.com/files/1172732/97211347701.pdfIn PDF document text
    • https://site-1176339.mozfiles.com/files/1176339/64487111690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fefa1df8c893.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/jQt1idY/zara_home_near_me_london.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5ff67a923a99d.pdfIn PDF document text
    • https://site-1178980.mozfiles.com/files/1178980/koronus_bestiary.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/hjajgvy/infinity_symbol_text.pdfIn PDF document text
    • https://site-1239447.mozfiles.com/files/1239447/57877918307.pdfIn PDF document text
    • https://site-1176228.mozfiles.com/files/1176228/real_punch_boxing_champions_boxing_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/JjjVjaC/dungeon_x_dungeon_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxisariwoboduz.epizy.com/gitejewoxuxijav.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_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 5636 bytes
SHA-256: b9e23fc60c231796b63167bcfcd936cb87f9067de5b9778d8c68cfc09c7f3e0a
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 11048 bytes
SHA-256: f81451eceb7abb1553a01f1d4313cf8913b12d74af095067dd4ed6514275dde8

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