Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e4213d7d0b9167…

MALICIOUS

PDF

92.4 KB Created: 2021-04-26 09:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 93fa81b770e6c74e0ccd233dc3cc3796 SHA-1: 8fc9f495ea27ec00c247edf4e0b1daaae30b6f9c SHA-256: f8e4213d7d0b9167811d636a74096897d617386af7d3d605e4b0cd9bae0a3664
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous embedded URLs, with one prominent URL pointing to 'https://golowaki.ru/strik'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=comprar+el+libro+azul+del+padre+gobbi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476133/normal_5fca28c71ed3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_604cdf7846215.pdfIn PDF document text
    • http://mscgis.net/16156773425hrjx2.pdfIn PDF document text
    • http://raffle.website/kopijisebururaeldaf.pdfIn PDF document text
    • https://sosojisizavawov.weebly.com/uploads/1/3/1/4/131454692/forinatiwamoriviguje.pdfIn PDF document text
    • http://xapepinozex.22web.org/zerozaboxibevezipurogufe.pdfIn PDF document text
    • http://fb-copyright-help-from.com/pioneer_elite_receiver_reset1u3ol.pdfIn PDF document text
    • https://wegidakalulat.weebly.com/uploads/1/3/5/3/135337254/2676930.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polebofoxajiras.rf.gd/63450981586.pdfIn PDF document text
    • https://e62d90d9-845b-491d-b9b1-804d55ccd6e6.filesusr.com/ugd/6af1ed_593325e74fca48d7b4e066f35ed1742b.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_e6b66161e9244436964ca2aa84c3ecbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0373ad5-57ef-4687-bce1-8156bd379e76/bugeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9becd953-6afd-483d-a2ad-0d1929f0f8b6/how_do_you_adjust_a_stressless_chair.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_6f22e88194dd4898878163c59892ad91.pdf?index=trueIn PDF document text
    • http://bapomel.epizy.com/lovirujibogulafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/312ef60f-9d03-4a52-a0cd-b766faf36f89/kuzorot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9404ba09-ec4b-420e-a8aa-a36a117bcba1/29848073706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2567d4-e25e-46f3-ab3b-3b7e8cd0ca93/28484477604.pdfIn PDF document text
    • http://jaxuliv.rf.gd/career_goals_essay_examples_scholarship.pdfIn PDF document text
    • http://pepajefosub.epizy.com/79943035438.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 2856 bytes
SHA-256: ead86d7d525715ae406ad275cfc48f0551e551d9090ef165ec88bed578a437db
font_01_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 5196 bytes
SHA-256: fe91c31038237b84c593c3f818c07567aebcccb561a9bcc53a52d48713e30a47
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 4472 bytes
SHA-256: 51e9bf012cbe8a7461dc15be343dafd892e6716630062f92a1a40e468882cdb2
font_03_sfnt_off00013749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13749 14792 bytes
SHA-256: cc29669560d5f1d55c9b689327d01c70dea141e2b2d8916c61c2eff25fc24f37