Malicious PDF — malware analysis report

Static analysis result for SHA-256 6852d5870062e3ee…

MALICIOUS

PDF

94.1 KB Created: 2021-03-17 21:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8b36cf39169e691b80e265bff3cc878a SHA-1: 4a774da563728772e97904c8b495659ce640314a SHA-256: 6852d5870062e3eeb5ad3638f4896d461c3076b7313ecc639ec3bfc17997d10c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous links and the critical heuristic firings point to a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=curie+guide+fallout+4 In PDF document text
    • https://cdn.sqhk.co/jotenitix/jiPQeqk/52116021716.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/associativismo_e_cooperativismo.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/bnijeve/96148252793.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/jugatiros.pdfIn PDF document text
    • http://mignonette.space/formal_business_email_sample0q2fz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_6010a4af50a29.pdfIn PDF document text
    • http://vorgazme.com/memoirs_of_an_addicted_brain8qa13.pdfIn PDF document text
    • http://instapriz.online/manual_mikuni_tmx_38l3jmm.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/lean_manufacturing_tools_in_hindi.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/LXKHjjI/ruzevoroseko.pdfIn PDF document text
    • http://vclean-sale.shop/chainsmokers_paris_piano_sheetcahl8.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/geralds_game_ending_bad.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/wobeli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_6046983a29d8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://betakudo.atwebpages.com/bose_rc-pws_iii_universal_remote_control_canada.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_424bc0b72cf243b6b1c029dbaff6ad1d.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_054078a1d17b4d31ad58be6b7723a801.pdf?index=trueIn PDF document text
    • http://mikijanux.atwebpages.com/marathi_barakhadi_file.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_c7df6bf616014750addc490a49ede08e.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_9ffebd837c0047929630513d4824ebf4.pdf?index=trueIn PDF document text
    • http://dufobirufo.atwebpages.com/latomafibabigixumon.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 3080 bytes
SHA-256: 8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b
font_01_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 4784 bytes
SHA-256: fe6c05e1718b6866c0a2335507d2ee21516a37bd1bbfd29e9e4cbdd39f7cd1e2
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 12988 bytes
SHA-256: 2d56c1d451c53e04afd1c3c2115f3b0ec9bdcc33e789a292777590b74ea2dc57
font_03_sfnt_off00015cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2