Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0c38db6e1ec4cb…

MALICIOUS

PDF

78.6 KB Created: 2021-02-15 15:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 366c804e00beee1ea949887266c70542 SHA-1: 5c3eeca793dd78b1c9b2aa882a43c5ee0806ccad SHA-256: 4b0c38db6e1ec4cbebd977643fcfee46f4ffe51d0f70e1bb7651a7bff7ff4309
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://maypoin.ru/strik?utm_term=how+to+find+angles+of+a+scalene+trapezoid PDF link annotation
    • http://copyrightmediahelp.com/call_of_cthulhu_rpgcbt37.pdfIn PDF document text
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/2a5d5008.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/hgdhgge/muzimagesifaga.pdfIn PDF document text
    • http://imedo.ru/confirmation_of_aboriginality_statutory_declaration_form_nsw2whq2.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/gdhbjdJ/koalas_to_the_max_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369305/normal_6002e3f2a5c74.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/9gf3gcH/dictionary_english_to_vietnamese_free_download.pdfIn PDF document text
    • http://bowaveridageg.iblogger.org/59477100262.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/vewopudodalowopikorasat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_5fd64542e8209.pdfIn PDF document text
    • http://reduslim-buy.site/jemanikuvazotuwuluj2zihp.pdfIn PDF document text
    • http://expressday.online/skyrim_dawnguard_cachesje6nd.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/btOKijc/vazabazurixu.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/cT0sNKh/90099737973.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/hbhiCig/1294179934.pdfIn PDF document text
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/fcabf260ca.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/gjgcghj/sonnys_rv_park.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/bullet_raja_movie_video_songs.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/sewuve-pidur-tapiwupariximot-vupix.pdfIn PDF document text
    • https://zirodamabesad.weebly.com/uploads/1/3/0/7/130740068/kisuleka_selobuxaforup_kagufudizulefa_wedapegofe.pdfIn PDF document text
    • http://smartcoin.design/assam_women_s_university_admission_form35obf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 5424 bytes
SHA-256: 6289e41b3d6ab76c6410771940ba3f4739c3244ab4847e61ea893eeecbdd29e9
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 12168 bytes
SHA-256: 0fbea424b2b0ff00055640c8ef3657fd0e218ca3c8aa1b2cbc54f2a11e6d2d10
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16072 bytes
SHA-256: 24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6

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