Malicious PDF — malware analysis report

Static analysis result for SHA-256 456630a8217c81b3…

MALICIOUS

PDF

66.9 KB Created: 2021-02-11 09:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 054d552aeb55bdbff5cec73333d34842 SHA-1: a890f0450fd15cdadc8153633808f3c83b1ef6d2 SHA-256: 456630a8217c81b3f3c0554b944ff7356a130a60d253ed97fb32b0b19846b95c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body contains seemingly random text and metadata, suggesting it's a lure rather than legitimate content.

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
  • 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/wb?keyword=balkaniyum%20tv%20apk In PDF document text
    • http://najefot.22web.org/sakusiwawenejakunurubazov.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/bafiwoz-kunojonazeke-nasugigokupuga.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/ifogdVl/lawatowotuvewev.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/f71e1fc.pdfIn PDF document text
    • https://cdn.sqhk.co/zepinima/X5Yhd5T/on_the_rails_texarkana.pdfIn PDF document text
    • https://mozakemu.weebly.com/uploads/1/3/0/7/130738716/matibuzikuwota_kexoloririfilu_xalovu.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/hdhckRr/zinewux.pdfIn PDF document text
    • http://auto-fishing-rods1.club/magic_coloring_coloring_pages_color_by_number_hardea7nb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxepiluwi.epizy.com/47559353929.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/mesapexowowawepitirofi.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/contact_form_bootstrap_template.pdfIn PDF document text
    • http://zufimot.epizy.com/xexupazixuzenusu.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/leaning_on_the_everlasting_arms_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/crawl_subtitles_english_free.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_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 4964 bytes
SHA-256: cd1257f51e02297edf348ce9d0f61442be7b1bc19613c66bea165327848cd978
font_01_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 11392 bytes
SHA-256: b6c0ee5c1bb7ecb022e13cf50456f3391422e51335ac8b92dd2eb0ed981ec8fa

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