Malicious PDF — malware analysis report

Static analysis result for SHA-256 f504007bb95f837a…

MALICIOUS

PDF

80.4 KB Created: 2021-05-23 12:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6946556ce0dd8d05942aa52df2da5e0c SHA-1: 123117e47675fbf8d4128e1b4885b24f6bdeef19 SHA-256: f504007bb95f837a7a7ea02907f1e7d4d90a16353bd9937e55146527f2216844
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://fokemale.ru/strik?utm_term=what+is+ethics+in+childcare PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493597/normal_601c785bde044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444092/normal_5ffbe105696a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_5fe936760c61d.pdfIn PDF document text
    • https://wixevilit.weebly.com/uploads/1/3/4/8/134873569/7ea91.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/24457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_60635c3a4db4a.pdfIn PDF document text
    • https://jonenatone.weebly.com/uploads/1/3/1/8/131872225/52039954f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_60379924823c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fec0302969a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_6069a0f64b357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_6057aad7be1fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fc80e6f2b4b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_604939c4b51d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_606dc994da04c.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/puxiwevi_bameda_fibolatusiwaxix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_603aa5369f2d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_60655480c2d20.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/wulow-xezirotizesej.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/6d159f69-4ede-4f66-aca1-49a0d256bc07/1200_calories_diet_plan_for_weight_loss_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887f8a2a-a85f-432f-802d-225f8a1be110/tozufopesuvipewuxoxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0cea0bd-9288-45ad-86f6-d2be3a3cca7f/blacks_law_dictionary_10th_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4403987c-fddb-4161-aa04-563a29eeea3c/renofinol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81a0140-6aa3-44ed-ad51-e2b1736987bf/how_to_manage_diastasis_recti_during_pregnancy.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_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 5040 bytes
SHA-256: d127d8acdce684989d71d22b03d5a475783ecad47cd122e2b55bcf55ee8cb69e
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 10764 bytes
SHA-256: d8d9a1efeb817eccf30a7624b26bab27ab264b307879f886659050269100ed48