Malicious PDF — malware analysis report

Static analysis result for SHA-256 268b17f124a3823d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 04:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9295bd1d922a949b5e6f242d25d0d634 SHA-1: 21b05ac2d0ffa94303c9677789f3ef91599f6dde SHA-256: 268b17f124a3823df23f5d5f5229374d7c42c1ed4a60c8a1c33366b18d5726f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to external URLs, one of which is `https://jacksth.ru/award?keyword=taxonomy+of+educational+objectives+1956+pdf`. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially search terms, reinforcing the lure of a document download. No scripts were extracted, but the overall structure and URL targeting point towards a phishing or malware distribution scheme.

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://jacksth.ru/award?keyword=taxonomy+of+educational+objectives+1956+pdf PDF link annotation
    • https://cdn.sqhk.co/lovolipeg/28kihlk/36632568844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_60358e9e00a4d.pdfIn PDF document text
    • http://reduslim-officialsite.site/88406357566j4h2b.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/bCjiljd/4366541898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_60270b1b2a31d.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/d0K7sjd/pezipew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_6056e5ff3774c.pdfIn PDF document text
    • http://nukels.xyz/2871748650075hka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_603fb47c4cd97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393349/normal_6002bdda1ba07.pdfIn PDF document text
    • http://it50save.info/anelia_resort_and_spa_fact_sheetekqjl.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/zafina.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/how_to_login_into_your_icloud_account.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losotejusegiso.rf.gd/5652321728.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/pofirufesisane.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/gtx_970_driver_crash_windows_10.pdfIn PDF document text
    • http://sudiwoke.epizy.com/jonesopat.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/archetypes_of_literature_essay.pdfIn PDF document text
    • http://pugamob.rf.gd/what_does_the_white_tiger_symbolism.pdfIn PDF document text
    • http://budobilososuw.rf.gd/bekhayali_full_video_song_1080p.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_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 6084 bytes
SHA-256: 7992326c1113dff4b8c4930ebd0afe2ff41d5be800ba493f979ab53d28703065
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10436 bytes
SHA-256: f75c76e865fcad0492d5579bf651121817a1d6dd43aeb070098122a852ca633b

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