Malicious PDF — malware analysis report

Static analysis result for SHA-256 d757a9156982527f…

MALICIOUS

PDF

61.5 KB Created: 2020-12-10 03:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ddf7673b8ffd084220d1e34011e41dee SHA-1: 20ebb48d7152a507d80ce5702ff2ac9ededafed2 SHA-256: d757a9156982527fd6f662905427c533095b33cdff2a66ffaa25746acc2c8b05
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'Hamlet objective test answers', suggesting a lure to trick users into visiting the malicious URL. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=hamlet+objective+test+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407302/normal_5fc7306dcb346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5fb2d89c823ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fb3c4b4f010b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5f97ae9035089.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/c9d3af0d-363d-4f06-8c8e-15e7fe1bad45/15281710454.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/la_princesa_primavera_cesar_aira.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/kusureremewazegosemeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0694ce1-4c2d-423e-85ad-238e0cb4200b/16361124686.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/reliance_infrastructure_annual_report_2016-_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4298a3-523c-45fe-84ab-2b983a62b6d7/netgear_gs108_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5323fedb-1cb8-4a76-a447-eda967980d3d/mikebomatujusavibanamej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1128cc84-0f7f-47fd-8886-1883e2b7cc83/jrk_property_holdings_reviews.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6a0fbdf132613bbe55b7c/t/5fc9ccc69309303fb831c434/1607060679403/22883263179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97626f8e-e30c-42ff-a253-91c1ff605218/clothes_hook_camera_j018.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_off0000b450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB450 5276 bytes
SHA-256: 82485f2f475debba32d33a70094053824e85d8410cc12ea9874e66846f3da8c1
font_01_sfnt_off0000c638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 10308 bytes
SHA-256: f349154ad70ae893dd37dcdec4ff16ae28f818902267ca44f3d51646dec21109

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