Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dcbe20cdb145a8…

MALICIOUS

PDF

64.9 KB Created: 2021-01-12 00:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6fd4a251220fb9a498189f50bf798b15 SHA-1: 70e84aca3ff0120663f514a41a6b4c9bedc4cc37 SHA-256: 52dcbe20cdb145a8090743b88dceba1bec56460e3cc54b9ca7e329790dd6c04e
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://cctraff.ru/aws?utm_term=estudio+agrologico+pdf In PDF document text
    • https://site-1202010.mozfiles.com/files/1202010/philately_quiz_2019_questions_and_answers.pdfIn PDF document text
    • https://site-1175555.mozfiles.com/files/1175555/jiverasivutifelovogonupa.pdfIn PDF document text
    • https://jepopiravu.weebly.com/uploads/1/3/4/1/134131497/luburafatuvabikokav.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/LhgTjdM/nupivosenozaj.pdfIn PDF document text
    • https://site-1166653.mozfiles.com/files/1166653/gowarexifiroza.pdfIn PDF document text
    • https://buxevuforuwax.weebly.com/uploads/1/3/2/6/132680831/runulekurivagotis.pdfIn PDF document text
    • https://site-1173987.mozfiles.com/files/1173987/todikagilosuvosa.pdfIn PDF document text
    • https://site-1178347.mozfiles.com/files/1178347/8333753095.pdfIn PDF document text
    • https://site-1178179.mozfiles.com/files/1178179/saketelud.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/fepij_gotasakofi_fedusimifeb.pdfIn PDF document text
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/1105479.pdfIn PDF document text
    • https://solugukaxazazo.weebly.com/uploads/1/3/4/7/134748989/1f6b4.pdfIn PDF document text
    • https://site-1173562.mozfiles.com/files/1173562/vamitabesaposexuje.pdfIn PDF document text
    • https://site-1178602.mozfiles.com/files/1178602/connect_the_dots_online_unblocked.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/0794a38.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FB 5280 bytes
SHA-256: 64294f9cfb7a1e10ee30c5ed80da554921e4b6c5a0acc32cb45befe2c4536e7b
font_01_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 10084 bytes
SHA-256: d79cfa0aa222dceb596b4217f572733ad5a6ac1527cbef14a415e439c838c281

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