Malicious PDF — malware analysis report

Static analysis result for SHA-256 891d5a41647162f7…

MALICIOUS

PDF

94.1 KB Created: 2021-04-03 20:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2864ce0177d908dc8a2c3c8135701c9c SHA-1: 470d9474aec9ab25bb37e687f4ee7efd85b09c57 SHA-256: 891d5a41647162f76b36ad998c9c77d34e5f1638cb2b2119e3e3fcad81859561
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL `https://soxebez.ru/award?keyword=agradecimientos+de+tesis+a+mi+familia+pdf` is the primary indicator of malicious intent, likely leading to a phishing page or malware download. No scripts were extracted, but the PDF structure and heuristics suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=agradecimientos+de+tesis+a+mi+familia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447436/normal_60240503949ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_605b663dc3a34.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/wisesinonevogopudijuraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_601d6e8315217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414868/normal_5ffefb44774a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_605fd3fe41ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_6030dc0200515.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/building_components_and_materials.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_60230196c9793.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/cetosis_humana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74596a5-37b9-42b2-8bb4-66bccc955dc8/13768809471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c312c43e-92b5-45f6-bcb3-c443578baa11/nawawekunirimaba.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/16977092238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be22fb4-fae5-4426-8a2e-fef5cb43dd3d/12_steps_and_12_traditions_step_5.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/integrate_cosx2_from_0_to_infinity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7eb72ee-f37a-4177-9e3f-c5b13acce54a/keluzezujafavuseva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be078d8-3b84-4141-b555-3c1b43b8102e/how_do_i_install_a_logitech_wireless_keyboard_k330.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/baxapajab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a5710a-a840-49b3-9330-5a5f983bc3b4/99623886155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a9bfcb8-c8ff-4541-b790-7cacb6b89638/nisojivonofoz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 9888 bytes
SHA-256: 17d613fc75a2afb99241b6df21272191c84cb5ff56e8451f0e7045db8920ab22
font_01_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 5464 bytes
SHA-256: 07c8dd64ec5571aba91f0222d8ccdd00725a86ebca6857ceacdf970dedd68c41
font_02_sfnt_off0001363e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363E 12464 bytes
SHA-256: f9bf67e398d5ee9963938da5567a16f67d0a90f794c6d843956e85b4336a766c
font_03_sfnt_off00015de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE8 3056 bytes
SHA-256: a2c257b44053fdc60ad0483d12e1aa9088379479549dcdbe52e7db6087f1e85e