Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cf779ec563b8eb…

MALICIOUS

PDF

82.0 KB Created: 2021-05-28 20:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9cb68d49b6222aa3da824d11555e77c3 SHA-1: a1d9af5f230b8a7ba0bd9abd54afffdcd4ed6dc2 SHA-256: c1cf779ec563b8eb93d7adf65e685f650e12923751746735e059848199a9a7fc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'resalured.ru', which is suspicious. The ClamAV detection and ML classifier also indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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=what+are+the+gifts+of+the+holy+spirit+bible+verse PDF link annotation
    • https://netopanuneju.weebly.com/uploads/1/3/4/4/134493403/diniluvoxoketa_fizunod_faxolurud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_602903b3d592b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4471256/normal_60b1262a50809.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/983982e4f48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_604935197fd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_600fabc4035f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5fd37703105c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_60419af69515b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_60277b4f4a042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5ffa3c2a76105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_606ae0a397246.pdfIn PDF document text
    • https://posasuzu.weebly.com/uploads/1/3/2/7/132710669/8419362.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/0782c345-b153-4e77-8e20-594c4bc18fdb/jeterurabafojof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1444b509-d497-4867-b89f-4880a37aa966/40468925478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d02cfc-7510-43eb-91e6-87b280e489a6/movie_maker_online_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e73d056-507d-4b30-a48a-c09819e183e1/16917005254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ee712e-7d45-430e-9086-11110c6b294e/tadapulezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0b58c5-d473-4ada-a644-e5a05ef4b08f/42039035053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4534fdd5-0a47-40c6-87b2-7c97c446c53b/taking_sides_book_by_gary_soto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111f5dcf-3681-4c7c-bbb9-fa677353ff0d/origami_with_printer_paper_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11ff111-c02b-44a1-bdd1-270352931da9/visif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc80b82b-1d13-4469-9967-f58c0dd88458/thidwick_the_big-hearted_moose_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc414590-c2c9-420a-b75f-b2fd1ac9ef85/jutupivisorexafumameg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa5d5cd-abdc-4890-8ba8-22fa6b88535d/suruvedisepuzek.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_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 5476 bytes
SHA-256: 38a9c87cd46194f48d0e62d1be2b3523c406bb0eda6a317fd2eeab4f96424ecf
font_01_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 10756 bytes
SHA-256: ed4f1ef996ceecafb65b160746f83ff27d741ea23b2525ab3d338929886481f3