Malicious PDF — malware analysis report

Static analysis result for SHA-256 93becb248f21acee…

MALICIOUS

PDF

113.7 KB Created: 2021-04-24 18:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ed52c38c00740e0598b1a216d5e2901 SHA-1: a21ef17376a6c39f7ab861f2980a2767ea1ae52d SHA-256: 93becb248f21acee6a27e1cfad7f4021b7e45dd546c053ac9385000ed123afbc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the malicious intent of redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=arthur+conan+doyle%2527s+first+sherlock+holmes+book PDF link annotation
    • http://jowivuv.22web.org/dominos_pizza_australia_investor_relations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_60447411b59f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6024f5c40729d.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/51547023541.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/luwirowifamibulatasekun.pdfIn PDF document text
    • https://zatitobeme.weebly.com/uploads/1/3/4/0/134097178/214f8e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5fc9997ad5b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_600e305adbb4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_60136dbe68ec4.pdfIn PDF document text
    • https://napuguvu.weebly.com/uploads/1/3/0/9/130969658/65fe029bc1d654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_606cdb1116857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_6048bdf758307.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/8f48d7ae-bf2b-4346-9e20-7691a7315395/36988304502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/310f0dfb-ebcd-4a1b-bda9-83e4f9fe6b3f/nenimamibanesupomax.pdfIn PDF document text
    • http://lodusebivepakef.epizy.com/nanuxukujixoginuwal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a9b391-ee8a-40bf-89ec-9af7b022294e/investing_books_for_2020.pdfIn PDF document text
    • http://boraxijud.epizy.com/markstrat_simulation_final_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f193abf2-1a3a-491f-99c0-b356eef0a1fc/ley_4_2017_del_suelo_de_canarias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5184ba6-b49c-4687-96d6-2d31dd75c32c/dusawo.pdfIn PDF document text
    • http://tazuwaxerufuje.epizy.com/cultivo_comunitario_de_arroz_na_china.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_off00017a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A43 5588 bytes
SHA-256: 4c471146038de555f6b37b9abee70ca4cb619e01307d2512c3abe5277a1b6230
font_01_sfnt_off00018d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D30 13892 bytes
SHA-256: 11c1335d344c0111aa842de8ae7514c489310f5cf4e6dc3877ae0dd71603bade