Malicious PDF — malware analysis report

Static analysis result for SHA-256 3720b78e278d8190…

MALICIOUS

PDF

75.4 KB Created: 2020-12-24 15:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ea87f0a778b71dfb13c0eed2935437aa SHA-1: b2d29789a25201708f56a951788540bfdc5203db SHA-256: 3720b78e278d8190c9fc1f2532e98a83f8e844f8bff5d66c1027b64f713adfc8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure designed to lead users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a known malicious redirector. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains text related to 'school supplies' and the wkhtmltopdf application, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=gonzales+community+school+supplies In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5f958e8f73961.pdfIn PDF document text
    • https://ronalowo.weebly.com/uploads/1/3/4/8/134872729/semojesugofogev.pdfIn PDF document text
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/wasixuponet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5fc9b0b22e85f.pdfIn PDF document text
    • https://midepixa.weebly.com/uploads/1/3/4/6/134622545/tidamiwuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e5da0c89-907a-4449-8201-bd703ef5846e/95208322885.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/30450483792.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/meliteriwezel.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/ralevejolekulofuzud.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/potamonalo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 5144 bytes
SHA-256: a43ab917b01473d82426e760f3cf55fae12c481af97a77f2fb0ab767785fcc1c
font_01_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 10676 bytes
SHA-256: d826463f340c338f79146dd1b51b6cb961ce96176725a12a603482ea2cd529c7
font_02_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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