Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39ca602b0f4988f…

MALICIOUS

PDF

102.0 KB Created: 2021-02-09 23:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3202e2d6abc7ecb46ea3eb831418b5d7 SHA-1: 41c48b948b049581fe327ed9aab68c283b28a0c3 SHA-256: e39ca602b0f4988f959c3d330f683653965e2d16434f7fca1ddbaca494860bca
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. ClamAV and ML classifiers also flagged this file as malicious. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document, likely as a lure for users to click on the external links.

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://jacksth.ru/aws?utm_term=coordinate+system+transformation+matrix PDF link annotation
    • https://cdn.sqhk.co/xuvisisitinu/dgfjaie/21333455183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366321/normal_5fc73991bd1c7.pdfIn PDF document text
    • https://cdn.sqhk.co/lojenozasila/jhgjBUA/pidamomevinonalelaxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fcbf27fe9294.pdfIn PDF document text
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/210a4416532a.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/2440723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_5fd8a2822e3b2.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/234d897a472a3.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/ggdgfic/yahoo_mail_organized_email_download.pdfIn PDF document text
    • https://fokepepepaxa.weebly.com/uploads/1/3/1/4/131483327/4967859.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/ijehbGw/stranger_chat_app_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/ii6gijb/teacher_appreciation_week_2020_covid_19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5feafb21cbbdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zopenave/bore_guide_cleaning_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/26383462199.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/bitstream_vera_serif_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/pifotorevesupelufu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/audiomack_apk_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/vcredist_x64._exe_free_for_windows_7.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_off00014f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F34 5096 bytes
SHA-256: f0e42cce40163696ae38b355272bd53a7d0178f38249fd9ffb7c3deab9480372
font_01_sfnt_off0001607a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1607A 12316 bytes
SHA-256: f8911af7d4c2fab9de1425125051386b489dc882bb416e9c4b94f01cc7ad0223

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