Malicious PDF — malware analysis report

Static analysis result for SHA-256 10df495106a34c25…

MALICIOUS

PDF

87.0 KB Created: 2021-03-31 06:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c838ec7a25a7b5ddcc37bc0b49045acb SHA-1: f14f824b8ebeea3538708442f481d948df29bde7 SHA-256: 10df495106a34c2534aeb1f449e75ba1c2aa416b76d41ca865215deea80bc589
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of the embedded URLs, 'https://druttle.ru/wix?keyword=swtor+bounty+hunter+arsenal+build+6.0', suggests a potential SEO manipulation or phishing lure. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=swtor+bounty+hunter+arsenal+build+6.0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467560/normal_605d6df13105c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5fd2723e4d540.pdfIn PDF document text
    • https://pugufatafa.weebly.com/uploads/1/3/5/9/135967981/bikuniwibujovosina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_605baa34d9eb0.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/potofilikaz_vixejilazafeger_bulerozusetega_wibukokizobu.pdfIn PDF document text
    • https://gawobomune.weebly.com/uploads/1/3/5/3/135317514/eee71e.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/4405943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_5fd3c1b37011b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fba17b31-f330-486c-99b5-db407b4735cc/33216356691.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_bf493aa887aa4570abce77f20a4ae6c7.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_747b3d42f69b4b4f892e8ae7c5040d5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c1f3b4-4abf-45c5-acf7-784766fca161/foundation_trilogy_order.pdfIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_2d2d44eb7e6141feab6dcb05380c61b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4ee82e-a156-4861-bda1-c635e95009db/7102384860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3981dfd8-79fb-48d7-88b2-35e3ba90bc99/46054619553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195a928b-f05d-4a30-92d7-43d2e8e370bf/57189300642.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_e5e63b9aa5c94d60965e57e4d4105c98.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_4636d040718c4d2c8b2a01d9ba4c4376.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/296026fc-bfb0-4c01-8a33-2f474177f44e/center_point_scope_4x32_price.pdfIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_5670db1190214119acab5754effea72e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 5560 bytes
SHA-256: 73387a7c9e1a83a9130beab5dae0c7d051817be015e229017ef99807b1e446df
font_01_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 11036 bytes
SHA-256: acd9ccae5c5ab0f9d14b7dc1b9d6a3bf504cee25a6664641508069059f111b85
font_02_sfnt_off00014044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14044 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34