Malicious PDF — malware analysis report

Static analysis result for SHA-256 1870d3a17e4ab3c0…

MALICIOUS

PDF

68.9 KB Created: 2021-04-07 22:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3b1d2a04d8fbeb5111126186ce1f3ec6 SHA-1: 5f24ce7759123d63753f6addb613dd4da29376fa SHA-256: 1870d3a17e4ab3c0e26a64d0396962660cfb310cbb4f178a8b10ea21e50db07d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=microsoft+flight+simulator+2020+release+date+xbox+game+pass PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fea3792d9f30.pdfIn PDF document text
    • http://tolosoludoxol.22web.org/fidaziru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460950/normal_5ff84fb8d17b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_601f0f1577475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_603c3bb2ed832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_601075e77b1cd.pdfIn PDF document text
    • http://wazokerimepam.22web.org/livro_ansiedade_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_600e094c4526f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_604cd14ac5d00.pdfIn PDF document text
    • http://labijubitif.iblogger.org/free_antivirus_for_windows_xp_filehippo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5fd7a57676725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_6046211513667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_60486e19a78c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5ff1ddb722e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_602a33a852d00.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/88d230f7-4041-4061-8794-246b706b04d2/kidde_smoke_alarm_manual_i12020aca.pdfIn PDF document text
    • http://xitutudatiri.epizy.com/foundation_one_sample_report.pdfIn PDF document text
    • http://jisodusajagijip.rf.gd/gifodopukudoziremed.pdfIn PDF document text
    • http://gelulunex.epizy.com/vawedojomukegobulisuzoven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a92386-6fc8-41bd-97e5-f50bb6e3d9bc/how_to_connect_ihip_headphones_to_computer.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_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 6056 bytes
SHA-256: 5985d3444737b0a176552932fbc5cea668a7f00c0f0aab03cdb95f748b0453e6
font_01_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 10196 bytes
SHA-256: 84d0d5ead46119e4a4129ebaa7d017bb334ee8302a10da38585b3816a219ddc7

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