Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb461772a496f7c5…

MALICIOUS

PDF

70.0 KB Created: 2020-11-21 17:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bf4f967ebf228e667022b3b9bf90af3a SHA-1: 21b4b8344f00fec6fa6e2963248b92a9e28f4b4f SHA-256: fb461772a496f7c50272734a45678148cc89d2290eb82332c16388935883b7e1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, and at least one known malicious redirector. This indicates a phishing or scam attempt designed to lure users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=aceite+de+palmarosa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_5fa832b860ed5.pdfIn PDF document text
    • https://batatifenosi.weebly.com/uploads/1/3/4/5/134513642/ddc115300aefd.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/70e50e3.pdfIn PDF document text
    • https://riwuwodanujebu.weebly.com/uploads/1/3/4/2/134234990/perunevarafap-lasejujuf.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/duzebajonufepunurudu.pdfIn PDF document text
    • https://kapefamutom.weebly.com/uploads/1/3/4/8/134849172/9400006.pdfIn PDF document text
    • https://nepagezefo.weebly.com/uploads/1/3/4/4/134472827/59b4ce3817e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5fb8240bcd2f2.pdfIn PDF document text
    • https://bululirujoko.weebly.com/uploads/1/3/4/4/134487270/bonaramuwi_bofamapiri_duwoz_sigogem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7468b6a-ebde-4965-857f-a778ed1b2d2b/garry_s_mod_unblocked_games_66.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEC 5208 bytes
SHA-256: 4f62a96068ee4e6df3f7c42b2b9c6c9fe6c231fd04b5d0aead96532120906303
font_01_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 10656 bytes
SHA-256: 8ee94fcf679910ed82994d5c7e8f9644922f7192d611cbff27576559b829227a
font_02_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 16508 bytes
SHA-256: 1ab116e283dde8aac2d56687afe3fdca9f24aa63afa541b632b959b1ade62732

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