Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4294333e5e8a122…

MALICIOUS

PDF

84.5 KB Created: 2021-05-07 01:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2aea500d56bfd88c2b3ab552a904daf8 SHA-1: 1b91d230d399e5c0806a4d8fe8f5c7fd4a7ebd8d SHA-256: f4294333e5e8a122a62d9be4ea7cafd100050032a9ff59608ed6fd175ee5cac8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=buddha+books+pdf PDF link annotation
    • https://cdn.sqhk.co/soxesemu/Ghgejjd/97267203154.pdfIn PDF document text
    • http://wilozobugo.iblogger.org/ashrae_handbook_62._1.pdfIn PDF document text
    • https://gupimarozak.weebly.com/uploads/1/3/4/3/134350981/vakagen-tumox-mesutorezugim-jewola.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/4icHjaW/allegiant_promo_code_2020_honey.pdfIn PDF document text
    • https://geliwesirodired.weebly.com/uploads/1/3/1/3/131382982/6093980.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/chrome_extensions_tutorial.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/weird_genetic_traits_in_humans.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/ghjibjj/kenimitofepit.pdfIn PDF document text
    • https://xonalofogikovor.weebly.com/uploads/1/3/4/3/134372302/0774a397abe8.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/jjjjieO/83146327774.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/mobajisakegitozaw.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/10158028196.pdfIn PDF document text
    • https://negopipeminote.weebly.com/uploads/1/3/4/8/134885603/matowupidudopirale.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/egje2C1/como_jogar_pigeon_craft_online_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/f1RibpZ/find_word_cookies_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixiriruturebul.rf.gd/oppositional_defiant_disorder_strategies_for_parents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c64122e-11da-4e6b-8b61-733cc76ab848/83234940893.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/sandisk_clip_sport_does_not_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8941af0b-6391-46a3-a4f3-9081cd7354c1/how_to_get_a_street_vendor_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cacf48d-8bd0-4440-8f9e-d78a5abdd3f0/87642476933.pdfIn PDF document text
    • http://guriseb.myartsonline.com/dedewenakuboxenivux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff52297-df89-4dc4-8791-20529e6e3371/babuxopurasedes.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
    • 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_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 5256 bytes
SHA-256: 8e4ceea86904eb82bb9526ee2bc075fa37333e99305d86f046a007522d968170
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 10876 bytes
SHA-256: a50501f4eb6b5e180e3b39df6faecd5e7ad7484746f95e27bd3c3da8bec386a7
font_02_sfnt_off00012dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15