Malicious PDF — malware analysis report

Static analysis result for SHA-256 665ff3207362bd2a…

MALICIOUS

PDF

124.0 KB Created: 2021-03-18 08:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bc7b08e1f018c81f3df878f33d379afb SHA-1: 38f7c3f380ad30ee5c91ca64040b3b7841157d25 SHA-256: 665ff3207362bd2ad6498e9f3e370d587ab964cb6cf71735f6c10de6e4e4bb2d
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 0.9996

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://druttle.ru/wix?keyword=minecraft+nitwit+villager+breed PDF link annotation
    • https://rofoxanubojinud.weebly.com/uploads/1/3/2/7/132740779/6775301.pdfIn PDF document text
    • https://radibutizuve.weebly.com/uploads/1/3/4/6/134649296/tunorapofuwufe.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/bigatumo.pdfIn PDF document text
    • https://rafodazav.weebly.com/uploads/1/3/5/9/135963082/9477795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_5fd1c4fd931c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_5fdb2472ba123.pdfIn PDF document text
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/xiferobesiwenelator.pdfIn PDF document text
    • https://lesesaxaxutetu.weebly.com/uploads/1/3/4/6/134613106/pituvenaxod.pdfIn PDF document text
    • https://rinavufapakoto.weebly.com/uploads/1/3/4/4/134460237/3467326.pdfIn PDF document text
    • https://sozugubew.weebly.com/uploads/1/3/4/8/134893137/vubajugegisov.pdfIn PDF document text
    • https://bowetupivivuz.weebly.com/uploads/1/3/1/4/131437724/6018495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499021/normal_5feb96069f3bc.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/498730.pdfIn PDF document text
    • https://wezisewego.weebly.com/uploads/1/3/5/3/135342704/wopujes.pdfIn PDF document text
    • https://rulofobu.weebly.com/uploads/1/3/0/8/130814337/vagekezepaxejog.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/f3d67b6e-4a42-431f-86b7-f90404dd9b36/52984667230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2486d0e-2076-47ed-b7e7-5fc4686a8a9a/5500087301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f10e06-52a1-48ef-8a3c-fc5ab125c82c/my_bloody_life_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2348b4c-bf25-4807-ad20-b3eb2256582e/52173573368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed489e1e-ceaa-439f-8689-11fcd7c3c208/oster_bread_machine_ckstbrtw20_paddle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2923c446-e62b-4b15-9697-b907ce3d02b2/barrons_math_level_2_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cd190d-c0d8-4e30-8e1f-1f3347b2e887/baby_girl_names_starting_with_b_in_telugu.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_off0001a715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A715 5308 bytes
SHA-256: 25c93bb42acb92a892518199b695a17d094defbfe8aba066312e3fa3256d379b
font_01_sfnt_off0001b959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B959 11808 bytes
SHA-256: 32fb1069a3714a74427b4e2879f3b65fff523b6b506849442343a2e48507b9e3