Malicious PDF — malware analysis report

Static analysis result for SHA-256 5103fe167a3e14aa…

MALICIOUS

PDF

82.2 KB Created: 2021-05-26 11:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2fd0b72a2fafefaedba30bd6c157e609 SHA-1: 926f776aff6f3510eadfc7a1c939ce3df7ecdc73 SHA-256: 5103fe167a3e14aa3c7fe37d1ae262e8f107a4f68ec0d43e140d76473307dfc2
156 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 0.9954

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 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.
  • 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://resalured.ru/strik?utm_term=blancanieves+y+los+siete+enanitos+cuento+corto+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fcdb3a449403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6065070c091be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fc977fe60d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_606352786de9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5ff53ef7288dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454049/normal_60079b32df653.pdfIn PDF document text
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/gagafebedu_zedekuzen_wolimadajako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370076/normal_60015b8780484.pdfIn PDF document text
    • https://xilinupuvawede.weebly.com/uploads/1/3/5/3/135350476/valanat_pegawoledonewa.pdfIn PDF document text
    • https://favasonod.weebly.com/uploads/1/3/2/7/132740296/9447230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_601dda87d07fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_603eefac97bc4.pdfIn PDF document text
    • https://mekiwukokoviv.weebly.com/uploads/1/3/4/8/134867966/9565262.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
    • https://uploads.strikinglycdn.com/files/ca2e00a3-1b8d-4ad3-803e-2d722bfecb51/snowbear_trailer_tire_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a7344b-e5e8-49d2-9f7b-8cd6f5d3bccc/xipogiridebojegowiwux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9598dae4-70c9-4d1d-9379-8ba8d91b1800/bimojuzafejozolikino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49afe03-a646-4f35-9fe3-1921a201392a/how_to_dance_like_elvis_presley_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa22d11c-f145-49ff-a75d-1a9b9ee361c0/12_cuentos_peregrinos_resumen_capitulo_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5563c21-98c7-4bbc-89cf-a291183bd9c1/where_to_buy_epson_ink_cartridges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97301507-0df8-4b1e-add2-966c7ff5790c/how_to_service_dsg_transmission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a17cf4-6a2b-417f-8db1-4df1ef362b96/brighthouse_universal_remote_tv_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b5ee9a-de1d-47b7-b468-d3c028818e37/collapse_of_the_republic_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b6ed5b-fbb8-4ba9-9777-9b8443f73a07/mufojotifikozukudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2decc1-dfe2-4351-96d8-866364a950f2/95434886087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb17c7f-9c61-44fc-b6cb-2ec46460a50a/victorian_language_of_flowers_sunflower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047c1142-8811-4c02-b1c3-c8ee78f8dcdd/logitech_wireless_keyboard_k360_black_usb.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_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 5240 bytes
SHA-256: ca396345d11667ee8bb441c2b05079edd92a0a85dc09bc0f2fb6ac38a808fef1
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 11588 bytes
SHA-256: a0af631ed2cf2d330a1e9b38c1616b082940ec9cd1b399034952aedab69b0a42
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378