Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecbd73816e22b56…

MALICIOUS

PDF

82.1 KB Created: 2021-06-05 21:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7d7fa044a505939027c92cf7c804a419 SHA-1: 21c858004a5e31a200453da33a9cab7f3f43cc07 SHA-256: 3ecbd73816e22b56de103da07249ff720c81b58c53ae07f5009c5395c4cd39d3
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or scam document. The embedded URL and the document body text, which mentions "bossier city jail arrests", suggest a lure to trick users into clicking the link. No scripts were extracted, but the PDF structure itself contains external links, pointing towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/pbw?utm_term=bossier+city+jail+arrests PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449788/normal_6034ddfab406e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_60225424a9bc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_6066ad4268c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_60338eeb95c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_5fd1e87398972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_600c5f38856bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_5fcab73df03e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5ff402696adff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_5fda2a26d9832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adeb630-ddd1-4492-8462-ce7e02dc5e23/can_you_build_muscle_while_burning_fat.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/ruwadunoxadevuru.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/holt_mcdougal_algebra_1_chapter_9.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/22455783643.pdfIn PDF document text
    • http://lakiluxodev.pbworks.com/w/file/fetch/144658065/solucionario_fisica_quimica_3_eso_anaya.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144678477/best_free_music_making_apps_for_android_2019.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/how_to_interpret_retained_earnings.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/risovojuwenudej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7314c5e4-0b51-4bee-84d8-3ffff288a200/how_do_you_crochet_left_handed.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/144535485/bose_wave_music_system_troubleshooting.pdfIn PDF document text
    • http://duriwug.pbworks.com/w/file/fetch/144633246/best_way_to_learn_sketchup_free.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/bivideled.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144678306/free_hollywood_hindi_dubbed_movie_app.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/ray_tracing_shaders_minecraft_java_download.pdfIn PDF document text
    • http://wevapejatu.pbworks.com/w/file/fetch/144539940/xewuduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6413786-1e61-42eb-9e2e-a8e62de86363/kisixuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efea2597-f59c-4d66-9517-376027c6f342/how_to_program_rca_remote_to_sanyo_dvd_player.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_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 5020 bytes
SHA-256: df019da7e7d7eb919c70e6a3bec9d1f28a95b51515de4b2397cac517b60471bd
font_01_sfnt_off00011683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 10704 bytes
SHA-256: 732bb67f10df2ee96b9bd6544983305f1e78c00e7d6cba43561bbeba2b0ef5b7