Malicious PDF — malware analysis report

Static analysis result for SHA-256 368184fb68162f4b…

MALICIOUS

PDF

81.3 KB Created: 2021-02-02 11:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 64011237689cde7027bb1ee50799fc53 SHA-1: 2d2aac0c4a55f88b38bfa29377163fc7d3cd23cd SHA-256: 368184fb68162f4b335932c1dd8c82050e7bdfc61e52247e7813ae569e31e0e2
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link directs to 'yafferge.ru', a known malicious redirector. The file's structure and the presence of numerous links suggest a phishing or malware distribution campaign, likely using the pretext of a utility to download further malicious content. No scripts were extracted, but the heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/aws?utm_term=fusionner+plusieurs+fichiers+pdf+sur+mac In PDF document text
    • https://cdn.sqhk.co/genepajev/amrYRPT/molepavelijixoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365575/normal_5fdf62a9b2058.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/kajamepepos-fipotulivubivov.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/dufesefetumujis_mizela_kawowujivi_tekom.pdfIn PDF document text
    • https://cdn.sqhk.co/razupojoja/hdsfjjb/papi_jump_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fff3c1e93ea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff792402233c.pdfIn PDF document text
    • http://workshop-fb.ru/14086437036lktlz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5fd1f052bde50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5fc5ef45095d4.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/notijikab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_5fde8e240caf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_5fdb77281da2a.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/0LgjVhb/58232449606.pdfIn PDF document text
    • http://jnatural.space/236272249965ic4j.pdfIn PDF document text
    • https://pokekuxabinupar.weebly.com/uploads/1/3/4/0/134016783/1471396.pdfIn PDF document text
    • http://salonvarna.com/jivobivtzp8r.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 6168 bytes
SHA-256: 0e87cd05f332aeb2a72b3daf131c0310eff8a4a40b86507956a7cca2f5d1d305
font_01_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 5352 bytes
SHA-256: ff8780ebc845ba41da6eb6499aeef9e8e66bcc9688c372afb98856d3b96c7c80
font_02_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 11788 bytes
SHA-256: 91bc35bcc54c128276defcd328128c04da293b998a5f955ae5a0409f62265d95
font_03_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 16104 bytes
SHA-256: c72ca0970d51b0a8ad78cefeb5ce5696832e14da31bd2128a4ba9c3d04a16bf4

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