Malicious PDF — malware analysis report

Static analysis result for SHA-256 74657d6a087f4d03…

MALICIOUS

PDF

76.1 KB Created: 2021-05-08 21:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 398a94eb893f9c48058c59cb95ff81fa SHA-1: 4ebab4d471a9b15c647cbfc0d4d7016a5799626c SHA-256: 74657d6a087f4d03bb10a3a6d6001056bd522c8813081cfa99167ba9bbc0f44d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL, https://vilenefex.ru/strik?utm_term=optiplex+7010+motherboard+specs, is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://vilenefex.ru/strik?utm_term=optiplex+7010+motherboard+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460686/normal_60370768eeded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_6047bca948235.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/Ehgtljh/77209363787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_60225fcacf2ee.pdfIn PDF document text
    • https://cdn.sqhk.co/ronobiberagu/1hu3r6Z/zatupuwubudixux.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/iRyjjkp/aunt_birthday_images_free.pdfIn PDF document text
    • https://zojevobe.weebly.com/uploads/1/3/1/1/131163992/e142fba2ebe.pdfIn PDF document text
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/8584644.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/2WFiegh/8182023741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_20b5c3caeb604441b367f3a0bf1919a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lulelepese/guzejovafa.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/corialis_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/lagu_dj_remix_asmara_nungguin_ya.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_f84adfa0dc7b454bb829e2619168061c.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_b52d28b6575b4b7ba971a24ee005a8a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/87225511926.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_9ff020ebea2944e28658f7eadd528ee7.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_4320666465ac4bee82a97f1a4d57aac5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/wupitavibaxozafaje.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/20515380674.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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 5824 bytes
SHA-256: 785112862620c010813deb79aa8a5f3b915d85030f6aa287d9354dd0631b4b55
font_01_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 10764 bytes
SHA-256: 29f0a08aa89623c476e71c53df1adab24422b5b7d3092a2e6be915404eb3de4e

Open this report in the interactive analyzer, or submit your own file for analysis.