Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c6f5cf6e86e3e4…

MALICIOUS

PDF

72.3 KB Created: 2021-02-07 07:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 915db6d201e3c70987a7fcc1dca0d31a SHA-1: 6152e93408d3fdecead0747c507415123e63f174 SHA-256: 84c6f5cf6e86e3e4de330d70ffaa1a32fa021bfdb270915ade3a0c2d1651ad8f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it functions as a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common attack pattern for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=biloxi+blues+play+pdf In PDF document text
    • http://lnstagram-copyright-supports.com/philips_heartstart_hs1_defibrillator_manualnde4m.pdfIn PDF document text
    • http://fanexaxujuto.22web.org/87551083180.pdfIn PDF document text
    • http://romeita.fun/technology_education_center_bergen_community_collegey7rip.pdfIn PDF document text
    • http://cadenalia.com/12771182130brk5f.pdfIn PDF document text
    • http://mivetys.xyz/43655741962p53bi.pdfIn PDF document text
    • http://rmk4sale.xyz/robert_greene_bookspezrk.pdfIn PDF document text
    • http://halfraire.xyz/astroneer_planet_resourcesh5nnk.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/hssc_self_declaration_annexure_e1.pdfIn PDF document text
    • http://okrasote.info/hatchet_chapter_questionspaixg.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/dibBhfP/22822387296.pdfIn PDF document text
    • http://fruits-summer.fun/17282995590fg04w.pdfIn PDF document text
    • http://damvglaz2.xyz/psychology_themes_and_variations_5th_editionj9hac.pdfIn PDF document text
    • http://naturalgood.space/baghban_rab_hai_baghban_song_ringtoneis396.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/8kU2t4d/plague_inc_ultimate_board_game_tips.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://tebalakafepikob.rf.gd/26634447681.pdfIn PDF document text
    • http://zikofizoredu.rf.gd/char_broil_red_grill_owner_s_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 4996 bytes
SHA-256: 81b2b6d854f54cc7af40284611045d7f87203405db45cca720dc24f72c9b66a0
font_01_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 11036 bytes
SHA-256: f8462b88aa1133462246c68371d855d7740602006996dc49918cbac6644b9329
font_02_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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