Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5574dbfd268c6c3…

MALICIOUS

PDF

81.6 KB Created: 2021-02-25 18:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fd88ea7fe3a0ac978c1b5d8963d8482d SHA-1: c29cc6822076d0865e73e71b7eb50139a80b3fe5 SHA-256: d5574dbfd268c6c3617a236e2d32a264f7384dc5dae1be8d23a81d33e3b3aacf
184 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, yafferge.ru, which is disguised as a search result. This heuristic, combined with the ML classifier's high confidence and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=best+books+on+personal+finance+reddit In PDF document text
    • http://zodatowafe.getenjoyment.net/why_do_companies_sell_receivables.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/53914978756.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/bhcigih/xekubojoxepafazuzebawodis.pdfIn PDF document text
    • https://cdn.sqhk.co/malakizojaji/ggdlnGl/78289373175.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/30120640668.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/best_compact_stereo_speakers_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/hxEicgf/kikemotupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5fef7c3b9dc5d.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/relomada.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hmPWtCP/tiktok_downloader_firefox.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/Uxfif49/on_my_own_ross_lynch_lyric_video.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/viiVd5o/vegawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kofabube/tariwesoxob.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/chest_guidelines_anticoagulation_atrial_fibrillation.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/xusipulepegopawufijoka.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/format_java_code_sublime_text_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 5192 bytes
SHA-256: 6f9de52ffc829da19895ee9e8472b37dfc7a1bbf5e0557bc6b132764ff221f67
font_01_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 10832 bytes
SHA-256: 96f3ba9df4e7e29a05830ed23ab5cd2f2df09d80bc70db785849c573b44bc628
font_02_sfnt_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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