Malicious PDF — malware analysis report

Static analysis result for SHA-256 185a9998c2eb9949…

MALICIOUS

PDF

77.0 KB Created: 2021-06-11 07:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f5ea515b325203491b7084649fb9a4b8 SHA-1: 0bd76a97034102a22deb0ed01fc42e4bf88a0e82 SHA-256: 185a9998c2eb9949bb97bb94f0b32c46b20715cd3a49daeee6f4c1bc0ffbde73
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary lure appears to be 'iCloud unlock deluxe download for pc', aiming to trick users into downloading a payload from one of the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/pbw?utm_term=icloud+unlock+deluxe+download+for+pc PDF link annotation
    • https://beweluka.weebly.com/uploads/1/3/4/6/134694692/0da3b72f21.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/909d54f2106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_60635b2fb3105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370063/normal_5fe1c68c7ae07.pdfIn PDF document text
    • https://linobajeg.weebly.com/uploads/1/3/4/4/134489040/sowutepidatanop.pdfIn PDF document text
    • https://lakukuvirukum.weebly.com/uploads/1/3/0/8/130874631/de5060c.pdfIn PDF document text
    • https://pirusamu.weebly.com/uploads/1/3/1/3/131383726/3120278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_6009bdb1b4cd7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387925/normal_60b55dc157b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_6025983c96c26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_6002e869b025f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_6019d0f3f3ab4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4420025/normal_60b5c9ab933e2.pdfIn PDF document text
    • https://bogexisamalalu.weebly.com/uploads/1/3/5/3/135320210/a0b3a8e0bf8c.pdfIn PDF document text
    • https://xusuzipurojovup.weebly.com/uploads/1/3/4/3/134325257/fajizenupo_filawaz_bofiriza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fe8ed2c825b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_602e04c02e0c2.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
    • http://fudejob.pbworks.com/f/mepenojulivopumotujedake.pdfIn PDF document text
    • http://vonodatob.pbworks.com/w/file/fetch/144913278/vapuwelogovin.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/griffith_electrodynamics_solution.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/isaimini_cartoon_movies_in_tamil.pdfIn PDF document text
    • http://dazokarodu.pbworks.com/w/file/fetch/145098552/udayar_book_download.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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 4884 bytes
SHA-256: 186fa41c616e89b22f14c6a0227f3e15ea5693b32be0e92b858c3f81b7d35d9e
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 10696 bytes
SHA-256: ba9c8b12f33b24fd7d23c2a3dc41d6ddb739c6b40567c6d305b3fea236111a7b
font_02_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3