Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4453eadeac6bdb…

MALICIOUS

PDF

87.6 KB Created: 2021-04-17 22:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5ead1233fed836c56d44bd426d665e6f SHA-1: b0f04083a37fe034d4128347be794bd32cf4f310 SHA-256: 7f4453eadeac6bdbab4bd536ef83805b0a4e6d8f80ed5c3f75ad556ab021eb88
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a mass external link farm, with the primary malicious URL being jottigo.ru, which is likely used for phishing or to serve further malicious content. The document body, though heavily obfuscated, appears to be a lure related to a common search query.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=what+type+of+oil+does+a+honda+gcv160+take PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367642/normal_5fcbe8f4ce451.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/edffNYb/55162492223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421217/normal_5ff791a3c8e78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5ff4cb5312e55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ffb9ec578973.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/iRj1pjd/marketplace_grille_gig_harbor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_60527f7a1100b.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/Ujb3Zjd/52923717366.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5fe14bd782ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_6012c42c54abc.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/hgWhfF4/grand_theft_auto_vice_city_ps4_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/eohfge5/wsdot_cameras_bellingham.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5ff7c68ff2d2f.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/fBjejav/android_radio_tuner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486537/normal_5fec996bd2b92.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/DwhaLic/international_business_rules_and_regulations.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/a9902931-7873-4a93-9cd0-930ad04a0e8a/fuwaxivomuvanukudovoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3c8c9c-cd73-4ffc-878d-b1f81ac00267/16582445873.pdfIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_0363f0be20b0470d94d12f7ebb6c5a42.pdf?index=trueIn PDF document text
    • https://9fd063f5-a6e2-47f0-a1c8-15c646e36cc9.filesusr.com/ugd/ee11ea_2f999cb505074270b24bce3be27b8ee5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/837dd2bc-9ec6-4572-a135-5fe562a7a990/mulberry_fork_wma_2019_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca3ea77-54a6-4f4f-96ea-be91db28ece9/98829883881.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_92bd6fb2b07b46b789dc747dbb845c38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef154f9-78fe-4ec1-ad07-d94808e2a4b6/weber_bbq_near_me.pdfIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_67f6be66c99a4e1cb9b6a104d22b44d6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 5908 bytes
SHA-256: 4118d8ee8f6b4aa7d2ededacf6388505976d95a43edabfd6d0d8baee4ddfca9c
font_01_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 11516 bytes
SHA-256: 6c6eed1f91b6985fe0600f3345e515685d095f74cb0f07173e88f47b0918a99c