Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab361e2080711010…

MALICIOUS

PDF

71.6 KB Created: 2021-03-02 15:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: be61b2b96253a05ad3969068d3ba60de SHA-1: 7bb3a6e6f5880a50cfc9df482437be46105df2ac SHA-256: ab361e20807110100cd934d4a7ef1529dcdb0ef7df00abf3172bc0faead4471e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate a likely attempt to redirect users or host malicious payloads, potentially via embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=zebra+zt420+instructions PDF link annotation
    • http://zabemaladameg.medianewsonline.com/81651713514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fee6dcc34ea8.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/cat_in_the_hat_babysitter_scene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_6036b1d82ff39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5ff019060ee60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5feb1830be8a6.pdfIn PDF document text
    • https://megelegekirir.weebly.com/uploads/1/3/4/4/134464092/delapiwa_lijapixipavedij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459774/normal_5ff4047c6bfa6.pdfIn PDF document text
    • https://difonokubile.weebly.com/uploads/1/3/4/5/134578156/serufaxubuzam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_6010b30536ac2.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/56784845877.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/getelamikolapuv_buzim_nevajutabe_kurigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mosezavor/feriados_puerto_rico_2019_ocalarh.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/51767397832.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/xodufagupisa.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/letter_h_worksheets_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/polaroid_is048_driver.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_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 5268 bytes
SHA-256: 54ed6d1fd3ba190f0e318a08a520f3fcd76fe936ca53f3cff3e8545e15547214
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 11028 bytes
SHA-256: 0b413b7c6156826232578f84826e3d2834cf321a7cf9fda26dab1aa84e418a37

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