Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73c7dc8539d5b60…

MALICIOUS

PDF

66.7 KB Created: 2020-12-21 22:37:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 06b7f27240757ab686a9e31b1562919b SHA-1: cbfcb18cc0a0ebfbd7a3ed93ce6fda22edbd2fea SHA-256: b73c7dc8539d5b60b03550a66e074a777337295892ca6925c47e7de3758329b0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Weebly and Strikingly hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=pastorale+secret+garden+violin+sheet+music PDF link annotation
    • https://patelevenimo.weebly.com/uploads/1/3/1/4/131437444/5090200.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/beparinunij.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/pixemilokuj-zetabope-lojomog-dazumonevoz.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/603122.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/tutapaxi/vapolununuwirinifegiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dceb735-9357-43d3-ac2e-8a473d3e9900/10688568489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a06f5f-58ed-429c-be7c-2e6742ceb1ea/jufekupapawopukotub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d083a3d-e70f-4fef-a010-5f3fac899458/fallen_2016_online_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b7966b97992eb567a9c2/t/5fc6849c7acac6192aa4a895/1606845596853/43411315240.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/oxidation-_reduction_activity_series_lab_report_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efdcb0b7-d342-4613-88f0-1fbb73336fcc/63379412586.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_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 5416 bytes
SHA-256: bc8718fe613e6d2fb248d150cff0679c09e471100406fb1c8272d6e2f8d59601
font_01_sfnt_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 10108 bytes
SHA-256: 2f2c47dd14ba233ab90f2a8f780ddf55dc3135629225f05d84a61922c5025acf

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