Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5d2936700af1da…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 05:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6ccc03c6e5a3d3bb1e7ff0314a7c4253 SHA-1: 91473400b32e37946b89649f5759fb70a9cf9010 SHA-256: 0f5d2936700af1da8fd4eac4365cf5452541937d6c0cc4228f000173af1e775a
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 0.9990

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://pelibifir.ru/award?keyword=land+area+conversion+chart+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410730/normal_60249c3122dda.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/lafumiwe-vefipiku-pujejolegore.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/9960426.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/705329da6ca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fda0b4822a99.pdfIn PDF document text
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/xazanunopepetovoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389581/normal_5ff2e29d2eaa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475562/normal_5fe0c644554f9.pdfIn PDF document text
    • https://wakolixib.weebly.com/uploads/1/3/4/7/134706528/3074372.pdfIn PDF document text
    • https://powipopes.weebly.com/uploads/1/3/1/4/131406611/5948415.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/zexowoja_zoxolut_silone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463560/normal_60066c56a21f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_602d6370c84db.pdfIn PDF document text
    • https://pavimukafimedab.weebly.com/uploads/1/3/1/4/131483282/sumub_tukel.pdfIn PDF document text
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/6e4e16.pdfIn PDF document text
    • https://kijujiwovijuk.weebly.com/uploads/1/3/1/4/131453096/tupinopev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450878/normal_6002451c39664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468831/normal_5fca892821dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_600a038241ca2.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/929f1226-dce1-488d-bb12-00f4ad34ba10/57112676314.pdfIn PDF document text
    • http://jofanemapax.epizy.com/angeletta_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e2e081-e348-4705-b891-66783224e4ad/49989797269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22100961-cfd8-43da-a8cf-683fca2b5ebc/xezowerufidirolososedi.pdfIn PDF document text
    • http://kidogip.epizy.com/ketefumuwinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e7d314-a588-4252-94e6-dff6fbe5675c/kinisoke.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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 5212 bytes
SHA-256: e43dc251c15f6990b00a2a3233da78036d8639f1855d6bde7ac68bb39ce07d55
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 10664 bytes
SHA-256: c4825120c1b20eee88ad365d66ffaea4ba698d1e6fcee04a4fcb0558d3e1e882