Malicious PDF — malware analysis report

Static analysis result for SHA-256 79095af203a243d9…

MALICIOUS

PDF

81.4 KB Created: 2021-04-02 20:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1950e86755b7d0cc169577c5f13b6568 SHA-1: b19f3398b694e2af5e9c286da1d72fab4517590b SHA-256: 79095af203a243d9f95fbe829dbe3791c485e5c4e8bbdfc911c05642d52bcab4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI and an image lure that redirects to a phishing site, as indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ponafet.ru/strik?utm_term=when+did+midnight+sun+get+leaked PDF link annotation
    • http://cleanup-sale.site/tegunuzidebiguzevized9imof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_5fd16d75aa65b.pdfIn PDF document text
    • https://cdn.sqhk.co/japanakoga/sVjh4TH/cadet_college_ormara_admission_2020_form.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/drtjCs9/crazy_taxi_pc_music_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6048426d17757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488810/normal_5fe43cff9bd63.pdfIn PDF document text
    • http://baltika-trans.ru/674167036880fzx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_60151dc9b6553.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/giii8gj/the_cw_the_100_season_7_episodes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_605df29357478.pdfIn PDF document text
    • http://cosmicgig.com/copy_sheet_in_excel_shortcut_key3ldbs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530712/normal_60660ce83fffd.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/bltbXie/37760155224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_602e26573bc7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_5fd7b16629786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_5fd825c8304e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_6023c678496b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 5220 bytes
SHA-256: e201478d0504faeef55b6ea396f899c37af564efd51048d09c6dc87de90d876a
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 2440 bytes
SHA-256: 49d5dbe9f6909e7020ce6eae08d1ee6f1e0814253a6b83dd94970c9714b5f76f
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 11764 bytes
SHA-256: 2c9d2347fa21815247b240f539fabd9258d9cc7a025b998e162dd51f146dad0f

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