Malicious PDF — malware analysis report

Static analysis result for SHA-256 85de70d48101b094…

MALICIOUS

PDF

67.6 KB Created: 2021-03-18 12:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f62ab491cf2eb167b6dcf11f53fc3060 SHA-1: 95686e85d32baf7addfe514cae2a214506950dc3 SHA-256: 85de70d48101b094d3b4f38728d7c2430b0970782dc550374cbf69db305eb13d
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://lozipotod.ru/123?utm_term=world+war+1+christmas+truce+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5fe55212d2cd7.pdfIn PDF document text
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/0a2a83383252ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_601044adcd997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_6019bf57b0b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_603d3ffbbde75.pdfIn PDF document text
    • http://juvasojiwal.66ghz.com/o_fly_on_piano_sheet_music.pdfIn PDF document text
    • http://lodubesemo.iblogger.org/baby_einstein_sea_dreams_soother_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374198/normal_5feff0e936c3d.pdfIn PDF document text
    • http://localdesign.me/overlord_light_novel_season_4qwzb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_603d736542972.pdfIn PDF document text
    • http://testvvd.xyz/717060749486piop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_5fdc175806cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_60517e858c6a2.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/2505091.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/66503301-37bf-4b4f-9ee4-591231dee048/76223780399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb182b3-6098-4e0b-821c-80acd2687f53/tokumajetanup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e365c6a3-4ee9-400b-afd6-e841295017f2/acute_angle_worksheet_3rd_grade.pdfIn PDF document text
    • http://wowejatilubus.epizy.com/sotifupopivisuvefebetiwe.pdfIn PDF document text
    • http://xebesisogunodok.rf.gd/probability_class_12_ncert_solutions.pdfIn PDF document text
    • http://bijipav.rf.gd/rurujugalizosi.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_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 5400 bytes
SHA-256: 4adb7f54e75cc5e2feebc94cf6a2aade5fe78c3dcb155604c8dab34308834b1a
font_01_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 10004 bytes
SHA-256: 491f6458707cd125e58b4e7c31419f7788dc64becc9bd47a63f728e210e0d853

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