Malicious PDF — malware analysis report

Static analysis result for SHA-256 837ba0d68e5ce846…

MALICIOUS

PDF

73.1 KB Created: 2021-02-17 06:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 7f2bf7a9b91a8c37a4631e19307e94f9 SHA-1: 0f2c49b6e93b9d53e3b962db72f0194a3a29cf9a SHA-256: 837ba0d68e5ce8469577e3a33a2369f4af1dea3053484db459b9a64264945144
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/aws?utm_term=how+can+hr+improve+employee+productivity In PDF document text
    • https://cdn.sqhk.co/xibidodoko/MgUVifP/47296923414.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/BibZbcT/jumping_frog_of_calaveras_county_text.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/bhhajah/36539221615.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/6Yhcihv/xutopibudigipikovedejiv.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/ibohghg/nazosegababasofejaxalo.pdfIn PDF document text
    • http://rujokevawevi.22web.org/masuxerifuguzinuwuwe.pdfIn PDF document text
    • http://zozegakipuvi.iblogger.org/guru99_manual_testing_agile_methodology.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/d503gel/42913033432.pdfIn PDF document text
    • https://linazigamatamab.weebly.com/uploads/1/3/1/8/131856602/1890591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/kufajumivolapegi.pdfIn PDF document text
    • http://rebobimakefeli.epizy.com/983937363.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/australian_embassy_visa_application_form.pdfIn PDF document text
    • http://zexukojol.rf.gd/h_aanit_capture_guide.pdfIn PDF document text
    • http://xumusuriwo.rf.gd/pathfinder_kingmaker_magus_sword_saint_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/bed_sheets_sets_walmart.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 5348 bytes
SHA-256: 7dc78ddad4360165b7bece8c3488cb5e7d5ea5e3cecd370311e525447306f7d0
font_01_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 9840 bytes
SHA-256: 0f79b6fe9e874b2f6c629dbe0c31c834f6a26cd8c48a7ba096db914c7d38a4c5

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