Malicious PDF — malware analysis report

Static analysis result for SHA-256 1729dcac7c71939b…

MALICIOUS

PDF

73.2 KB Created: 2021-06-04 06:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3b1eb8c1a4bba9d0817f036f7a94a9ee SHA-1: 800525ebd2d2d1f87328bfb45af0b76c5234b0db SHA-256: 1729dcac7c71939b146f81ff4e0567a13a6267e3ae67359209067efa195814f7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a prominent one pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, reinforcing the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=mailchimp+contact+form+wordpress PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459936/normal_600eebc391067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fd34e3043e69.pdfIn PDF document text
    • https://zudavarasosala.weebly.com/uploads/1/3/4/2/134266164/71e3cc885c1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_6011f7d5b683e.pdfIn PDF document text
    • https://judixanasagik.weebly.com/uploads/1/3/4/6/134688655/423447.pdfIn PDF document text
    • https://zasipirowi.weebly.com/uploads/1/3/4/2/134266189/delavegevef.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/nematewikuwin.pdfIn PDF document text
    • https://jatisarekitikez.weebly.com/uploads/1/3/4/6/134661612/9875623.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/pabik_mupix_xoruxasomefik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5fe273f3d8253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_605f934aabc6f.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/519c61d2-f6df-4613-9879-f1fffb222de2/property_disclosure_statement_bc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3452456-042b-49bb-b150-ae3f71a87419/licencias_para_eset_nod32_hasta_2022.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/f/39382832050.pdfIn PDF document text
    • http://jutopar.pbworks.com/w/file/fetch/144540642/stoichiometry_word_problems_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cb6156-7a8a-4f6d-a5f0-5c67066ea054/engineering_materials_and_processes_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742c4488-1b24-4622-8af3-58f2208dec70/evan_moor_6_trait_writing_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfc1784-5f0c-4499-9df2-179c3f102b71/tezatagevanelebe.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144580590/free_roblox_robux_generator_2018_no_human_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21606b1-542d-416e-b01c-10aa360788f6/65961875062.pdfIn PDF document text
    • http://padimagofo.pbworks.com/f/toxup.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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 5492 bytes
SHA-256: f440ae3b3dc3394cfd5112c946210846007fd016eb8c17dc0cc45d046ba236d6
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 11172 bytes
SHA-256: e69c35b2a2c59df301d6d3ba9ee536dceca400cfd5fd1d5f58b0fe9c3c843b41