Malicious PDF — malware analysis report

Static analysis result for SHA-256 590ad4c81d71c7f8…

MALICIOUS

PDF

101.8 KB Created: 2021-01-02 08:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8414470c247bb2a1c47a409f2dff0101 SHA-1: ce340b1c50a096a324bcf4ab73659cc22df053be SHA-256: 590ad4c81d71c7f87b645a040b26300a258047d690480b956b75fdcf7893ca8d
244 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 PDFs hosted on various domains, including a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malicious content. The document body is heavily obfuscated and unreadable.

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://traffmen.ru/123?utm_term=16th+century+french+peasant+clothing In PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/8a45a1edbd62b07.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/webojikijob.pdfIn PDF document text
    • https://wipiduwofudozi.weebly.com/uploads/1/3/4/5/134588456/raravuzefeke_wiwisomedas_kokofurasi_xirexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5fb889a8a4087.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/dosarone_nemamume.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/7593403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5fcdfd683810f.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/15b2df9855.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/wibedubosateg/jaxapumeselovowulowuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4ce693-1393-4731-b176-4be1c428871f/claw_machine_costume_made.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1cdd70-d2fa-441f-9bfd-dc630c164f30/the_week_puzzles_june_19_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77abd25-cff8-43c5-b8bb-7d4f65c13c72/55323401607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b948c1-d5b8-458b-8d0f-fa1d11eed921/9012243921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83604f3-4696-44dd-81d3-c02c74a5efc6/31992677578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09088bfd-9fb0-4747-a973-0dda8c4179e2/ninja_village_naruto_apk.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_off0001515a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515A 5488 bytes
SHA-256: f214c8bb4d71ce752a57a0a3e016eaaf11a7c2e615e21e52de7afa0a8c505d10
font_01_sfnt_off00016417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16417 11696 bytes
SHA-256: 40563d3234cead9b02a48bdea8f8a356beb1ec02e19f4cae993cb1c7964fa923

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