Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f7d0ebc91c1981…

MALICIOUS

PDF

66.9 KB Created: 2021-04-25 03:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 638d8952403f8c574120489e5a9cadbb SHA-1: d606978fffa4588517f99061eb95ef79219dc07f SHA-256: 86f7d0ebc91c1981835971f78249c9e549dadf383c399bb32cd6cb7171e661b1
156 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. 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 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.
  • 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://maypoin.ru/strik?utm_term=how+to+replace+intex+pool+liner PDF link annotation
    • http://soldonlittleton.com/harry_potter_and_the_half_blood_prince_chapter_15_lingualeo1hij2.pdfIn PDF document text
    • http://damewumesigalut.medianewsonline.com/sanarowiratelogojizowok.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/rodrick_rules_book_plot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478703/normal_5feb45ac2bf19.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/71849680101uxggs.pdfIn PDF document text
    • http://maykistore.ru/lutekuzixai162x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60136897ca2bb.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/cambridge_igcse_geography_past_papers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469145/normal_602478d80e3a6.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/kubota_v1505_diesel_engine_for_sale.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/ropivavenopuzumune.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/total_gym_tv_promo_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_ffea832324264736871faba1cdb660a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/betrayal_at_house_on_the_hill_legacy.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/ccna_200-_125_lab_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/how_to_install_epson_wf-3640.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/endospore_staining.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/babu_zamidar_song_jassi_gill.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/camera_lucida_reflections_on_photography_summary.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_ad28ce7a3ab2409197c749f7756eeda1.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_off0000cae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 4868 bytes
SHA-256: 66ff1c410a2c7ce1a4f7731328e0e206dc32d19e31d2e9c37481652f43c6693d
font_01_sfnt_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 10108 bytes
SHA-256: 3b783bcf078a57b15fdbdcada35f34e18eda083c38cea251152530eff697213e

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