Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3b02951399cbc9…

MALICIOUS

PDF

98.7 KB Created: 2021-06-11 22:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 80e25b4ae8705521edaff32f11429fe9 SHA-1: 7c8e0237fb67f61629f5b8233cbbe4c66063224d SHA-256: ca3b02951399cbc97fc2db7890f606ef23b610f0bfaeb0c4e7292a791bb3427b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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
  • 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://drafthe.ru/pbw?utm_term=ready+for+first+3rd+edition+workbook+soluzioni PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417824/normal_60357ef607b19.pdfIn PDF document text
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/leporitem-poxaset-panuwunetagatuz-gimekesosab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_605c73d3c6d34.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/wopaxovapagus-fozudux-bulep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5ff468077bab3.pdfIn PDF document text
    • https://vidapinuluselas.weebly.com/uploads/1/3/4/8/134865598/8481117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487894/normal_606ea555dba4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_6004eb88dca19.pdfIn PDF document text
    • https://zisirusezudi.weebly.com/uploads/1/3/4/8/134846547/599a9fb0e6745b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6018e26a7f4e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_604b2c34ae2e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5ff459d497233.pdfIn PDF document text
    • https://suzabotofofetab.weebly.com/uploads/1/3/4/7/134739937/5295271039c0b.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/lanaridovadoduteram.pdfIn PDF document text
    • https://dubigeta.weebly.com/uploads/1/3/5/3/135341625/fumewedojuduta-japudopubulone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_604fa86997fed.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/363c6ffd-2ca2-41e8-a241-be09db16939a/is_gta_5_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f14e812-949a-4349-bdf2-ca95b7b7dfa1/install_kali_linux_programs_on_ubuntu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc72a18-1d26-4450-b8a1-6823e96a1acf/tujalizepelililurawozuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3991972-6ac4-4833-aa78-a0bd9efa9c48/how_to_edit_2x2_picture_in_phone.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_off0001445f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445F 5520 bytes
SHA-256: 270d5ef7950e208a86d0e2de242c551a3cfc9022ccd9aabcc46fb0237f43c550
font_01_sfnt_off0001575d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575D 10640 bytes
SHA-256: 044977d7e3207cd587af49c1294a67a26a5ad6db25bd955cb478bf8952c26583