Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f374ce515b6d3f…

MALICIOUS

PDF

67.5 KB Created: 2020-12-16 22:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4479b7bd0ad35906d8c9723e7f6b4253 SHA-1: f4f0331f70dc7c2e417304ea15df5f88f7628194 SHA-256: 81f374ce515b6d3f470ad60cb7b59f365e9ba76ab47a9e871b4728b7b9769212
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF link farm' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lead users to compromised or malicious sites.

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://trafficel.ru/123?utm_term=wida+key+uses+4-5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475999/normal_5fb8bce48fd39.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/zaxibodafenomawemid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5fbfbb753f69c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5f96bec854d60.pdfIn PDF document text
    • https://migamusuzugu.weebly.com/uploads/1/3/4/6/134657386/7450772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5fa691213a56c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_5fd9df46f2a22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f8db424d4f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5f901f177af80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc100ee92c50b1a1e781c95/t/5fcebb168fe6b7357675ea31/1607383832152/air_attack_hd_lite_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/juvalibubonenuzeka.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/deep_learning_book_bengio.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57a2a1452f90b7f03fee5/t/5fcd8ee88a55f2188b90f858/1607306984828/dotloop_agent_support.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c7509698b02c7f421fcb/t/5fd1f0f4071bbc68802e2587/1607594233814/mcpe_servers_for_1._13_0._1.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 5

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 5116 bytes
SHA-256: 84ee6f27960797bf6f087fa2d87de413aed4395f9bc6904cb51a587192788fa6
font_01_sfnt_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 10976 bytes
SHA-256: 9f2826ac205db5f4a865daf9f59eef02cbdbc320aafb7f75d7960421458de6a5

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