Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64b9c70dd4e05e9…

MALICIOUS

PDF

85.0 KB Created: 2021-04-02 20:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1b75391f8796ed51fc69c3058fdc3014 SHA-1: e615d51730a8d6481f46de60633d68b47cb8e677 SHA-256: f64b9c70dd4e05e9261eef3bcf1fd2280b43bf0d21d966de9c67e6f600d1fa11
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 0.9998

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=tai+nghe+bluetooth+lg+hbs+800 PDF link annotation
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/zawose-fusepanomod.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/4670946.pdfIn PDF document text
    • http://lnstagramcentre.net/58464542420zi366.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/7611538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447646/normal_5ff320fc0ef3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5ff4273db132e.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/e7ebb8da55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_602adf880cb9e.pdfIn PDF document text
    • http://vkrowl.com/bafatufccqi.pdfIn PDF document text
    • http://subfamjtii.site/wusivomirogilisegqzbh8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370090/normal_5fc67eb6f0a09.pdfIn PDF document text
    • http://wgathering.org/which_star_is_very_similar_to_the_sunpfygy.pdfIn PDF document text
    • http://raisinshub.club/hp_elitebook_8560w_webcam_driver_windows_10gxien.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/c3176403-0cae-4650-933d-0832bc673bb6/non_adaptive_behavior_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8372dc64-d543-4c78-9daf-6ad60f3dd2b0/butap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f464d10-f2ea-42e3-b341-4357cbe9d1a8/22754628253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba298660-865b-4cdf-8b6d-79ce11567702/yamaha_timberwolf_250_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b98eec-2605-405f-bbd4-febd102e0c3e/descargar_anthony_santos_popurri_bachatas_viejas_en_vivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa10bdcb-cc76-4878-9351-41ac1ba111c0/attack_on_titan_season_4_episode_6_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf953de1-d54c-474e-80f4-9431f61a9326/34900904384.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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 5276 bytes
SHA-256: edab1c29581af2ab41d0e64be13e4c6d52f3330632e521b0f80ce638123c2ff7
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 22296 bytes
SHA-256: 4c6106d1c9c14de89159a8effa54dd557dab90f38bb5af6eb0c130d115dbbff9
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf