Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b3916dc87175f7…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 15:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 219f0460e13bafd71132729d8a777d0d SHA-1: 70601e9d2f41374ce40668b7ad5d00b2d174bb2c SHA-256: a9b3916dc87175f77657c1a0a902f9decf3e2de2d975f58c23fad12c9438993e
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. 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 0.9991

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crophysi.ru/123?utm_term=whatsapp++latest+version+2018+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384295/normal_601bc29a648b6.pdfIn PDF document text
    • http://bluebadgeform.com/fetakozekudunajedon9uyj.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/14784867263bcjno.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/multiply_out_the_brackets_and_simplify_calculator8lsl9.pdfIn PDF document text
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/mogowusuzapa.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/3466217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_604e228b2189a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_600dc88c3df8a.pdfIn PDF document text
    • http://reawont.online/76960618297hzhdw.pdfIn PDF document text
    • http://jobware.pro/windows_10_video_editing_software_free_downloado3y6f.pdfIn PDF document text
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/goxifejo-xisigu-xodugivagala-xuxog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381543/normal_5fee0d16311bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6021e926930fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369657/normal_5fe3fbdf7cb05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_602fd24e95d4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5ffc328fd53ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5fde6f5885f68.pdfIn PDF document text
    • http://souve.me/weather_forecast_for_bulawayo_next_10_daysks7p7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477916/normal_60069b3376389.pdfIn PDF document text
    • http://classkaod.ru/66330182678cls1m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_1a3d5e2bf8344c05a1614dea91c12633.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_36cb553efe76435fa4a17eef15e5b974.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_b3aa349927604f75a0a5d613ae8d7fd2.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_bc35e2d07ffb47d59af38cb7a6c6eedc.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_3a67f8768722422fbfac50e8d01db1f2.pdf?index=trueIn 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 5696 bytes
SHA-256: 6e3025983de24be1556b4a4d2ff7812c4521e30adcc58be3cc4181d8027f87f0
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 14272 bytes
SHA-256: dba1875da10cf8c65d0e2d76651745bdc05e7a49a0216aea3b5edece7e7f79f1

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