Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb55d218fb14b70…

MALICIOUS

PDF

79.2 KB Created: 2021-05-17 07:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 64b22cdcc0836c23b4aa8ddd8dfd3750 SHA-1: 721d88452a951d56a14d609e770362585fdf0ef5 SHA-256: 4bb55d218fb14b704bbe5dd6f9c56963a84548c0481eb2f201a6dd445e77744c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely leveraging techniques similar to JavaScript execution within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/strik?utm_term=connect+vizio+sound+bar+to+xfinity+remote PDF link annotation
    • https://cdn.sqhk.co/zinoliwomi/jcRDria/fox_racing_logo_wallpaper_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/hK7igor/amazon_prime_video_movies_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fdfdd0ed64c4.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/elements_of_biometrical_genetics.pdfIn PDF document text
    • https://cdn.sqhk.co/narobalof/jieIjhq/nosotumebokopu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fedbba9594bc.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/lapupatibajigarukemu.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/q6TQZia/gigofubabuto.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/5vcgdgg/34549963017.pdfIn PDF document text
    • http://goxezidoge.22web.org/pobakixibetoxumegemeteva.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/physical_science_gk_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/jcGCZK5/blackpink_jennie_outfits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_60357bf357c55.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/ssghBjb/vr_videos_3d_download.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://nelibodelil.rf.gd/which_is_better_software_or_mechanical_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f776c5-51db-444a-8051-7ff9d63ca75f/what_is_the_tree_called_in_norse_mythology.pdfIn PDF document text
    • http://teruwizirazi.rf.gd/accounting_standards_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de266c8-2a31-4122-ac17-617dabc57b8d/whiskey_words_and_a_shovel_iii_quotes.pdfIn PDF document text
    • http://fuxazulofonu.epizy.com/99360835673.pdfIn PDF document text
    • http://gevewodex.epizy.com/15759147210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421a124e-3d95-4b6d-ab7b-822b2653ce36/zejitiminadato.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/pdf_converter_to_word_free_download_for_windows_10.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_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 5460 bytes
SHA-256: 783b1247dc5e1132f6c3bd7ef1802c692cbdef4a471c2e70e4f4d63534391d61
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10220 bytes
SHA-256: 0915bcdba29a6313b90ea3045bcfce7247e34f93542a202f85f607898308ec69
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2