Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ef7c1774744d69…

MALICIOUS

PDF

82.4 KB Created: 2021-03-28 19:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 547fcaf0e804358af8867fa6d90a2b30 SHA-1: 5493b08064eb4440271fe0eec5c85f7987536757 SHA-256: 22ef7c1774744d697565e334e5f6967184309a88346261f3ba1f8f605a8ca96b
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links pointing to various external PDF files hosted on disposable domains and link farms. The primary heuristic firings indicate that the PDF acts as a malicious redirector and a link farm, with one URL specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://dafemum.ru/award?keyword=basic+electronics+components+working+pdf In PDF document text
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/1a68b34417d2f.pdfIn PDF document text
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/3781581.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/8713812.pdfIn PDF document text
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/5352959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_603a63d9245fd.pdfIn PDF document text
    • https://pakuxijinede.weebly.com/uploads/1/3/4/5/134527704/gezojadizogeg.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/josiletavejak_donegefom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fda20906f9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_604f93de3b384.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/bb1e47d0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_6041368053a01.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/f2498a365b90.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/76725764910c.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/jbgiicD/cute_drawings_of_animals_pinterest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_601f1ab9e401c.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/g1hfOgA/the_maze_runner_book_age_rating.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/glOegh2/bts_graduation_song_korean_lyrics.pdfIn PDF document text
    • https://wijinopupog.weebly.com/uploads/1/3/5/3/135323990/navobalose-zutixemo-datelezu.pdfIn PDF document text
    • https://joduzowulidu.weebly.com/uploads/1/3/4/4/134435513/lulufow.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/ruxataveruzagufelul.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/85b0b4a8d1f0c59.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://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_4131aef0e53741868464cf4dd52d02e7.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_6960af0f53be498c99ad88c69a15818a.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_75073cf3872a4e93b4173d0537d368dc.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_bd5986c3f6b5466b9f3268e21a9ab75d.pdf?index=trueIn 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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 5468 bytes
SHA-256: 9d64bf84c4ea83c9c81bb7ce0f6970cfeb5fc9ba9e4956ff73d37d017d4341e6
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 11396 bytes
SHA-256: ad7245ffd41eb5bf1d870ad7bdcb806680b188195f6e4ba22d89a8e4e881f646
font_02_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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