Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0db8718793ff13b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-11 21:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f924642a04a656e6fea340b871ef065 SHA-1: 210aaa40320cb7de043f9d97649d3d660d979238 SHA-256: a0db8718793ff13be9668894707da2014478dd0ba58ce184f2a9611072d15331
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 0.9998

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/award?keyword=resuscitation+guidelines+uk+pdf PDF link annotation
    • http://gisomog.iblogger.org/how_to_count_points_in_500_rummy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_62b1c26c1e1e44eea9a84158431fa0f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30a1160-cb85-4a6d-aad4-36d123ddb038/life_without_limits_indonesia.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_74496c864e8942809de27cb480540d35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7105489e-dd96-4558-8dc6-a3c8aaf67710/who_makes_country_comfort_wood_stoves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43194819-2ab5-4b76-92f3-1a2ceba940d1/33835090682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60352ded-f613-4e50-9df4-13ab1956f04f/2003_dt466e_valve_adjustment.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_da5455c373b342f29c0947c4f8decde9.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_47375e55b3a94e3ab8981b81b211c2d5.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_8bc4316e910941a19d5f9a31b32fa5a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06365d4a-6e26-4c2d-88ba-df893cef4c86/wd_my_cloud_support_phone_number_uk.pdfIn PDF document text
    • http://befojarariwowab.epizy.com/technical_writing_tips.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_fd559810dcb44f9f898d735d4200f4c5.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_665cbf2bbf754adea5a9eeb98adb508b.pdf?index=trueIn PDF document text
    • http://poxoner.rf.gd/43969320111.pdfIn PDF document text
    • http://gexijobuvakoxob.rf.gd/82120083003.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_0f72eb95e1b644a89e908f1450b3924f.pdf?index=trueIn PDF document text
    • http://sasebuza.epizy.com/how_to_set_up_the_stealth_cam.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_72f9c026e620485f8b8c580b23c86e9e.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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 5296 bytes
SHA-256: cbf08f07a6fb9e6087370a2d50234a59c5c78e205d746b93aebdd2f5b7ace3de
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 12204 bytes
SHA-256: 66bbcafa67ba4c93a3431936b15d8689d1ea7a51608c814306e76019b26c0d34