Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd31086ac7052e0…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 15:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 60724797b4ffa8cc28f50e471bd20f84 SHA-1: e6ea60b5a5047354da118bdf33973fefa1f87bc3 SHA-256: 0bd31086ac7052e0f7dad4657a46e0622a6849a9ed5e216b078f4eeaaecf455e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'xajibur.ru', suggesting it's used to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that this PDF is part of a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=oxford+bookworms+library+pdf+audio%2529 PDF link annotation
    • http://hairhome.moscow/stihl_ms170_chain_file_size7ik91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5ff1d49598fb2.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/how_to_get_splat_hair_dye_out_of_sink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_6003e122e4188.pdfIn PDF document text
    • http://my-credit.info/autocollimator_principley1sby.pdfIn PDF document text
    • http://top-shop-store.website/clinical_guidelines_in_physiotherapy_practicei44m2.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/aii7lhf/14997798941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_601012c35c97b.pdfIn PDF document text
    • http://penageli.getenjoyment.net/danby_premiere_dehumidifier_ddr60a3gp_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_6035060c37f70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5fdde42b6f697.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/ibhhjiz/pandemic_ebt_ny_august.pdfIn PDF document text
    • http://forkidsshop.online/wolij3yi82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_6030145db6430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_602179d64f177.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/dd31653d-db87-484b-9b57-4ec9beae4a95/craftsman_kohler_pro_26_hp_v-twin_manual.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/beowulf_full_text_modern_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df82c30-8792-4cda-ab9b-7b2e7e96a7d1/mubumunezajiligirigifip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76b1e13-9117-4177-bcd5-290b6ba37082/how_to_use_water_softener_pellets.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/5436591371.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_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 5756 bytes
SHA-256: 67df14f406d014a50bfcb7aaa0c3a65d49934d2aa0bd34449385d84961200054
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 16320 bytes
SHA-256: 798c3c1dbf7932cf74207033afb299d0726df294f5f82ac4b0338a70d2734714

Open this report in the interactive analyzer, or submit your own file for analysis.