Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a4173225c1d029…

MALICIOUS

PDF

77.0 KB Created: 2021-06-07 20:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af3bec68228e8894d8889f70522e835f SHA-1: ed1f963b4104fdb5a6df174e00a25fd1655be8bf SHA-256: 88a4173225c1d029f196971e791262b75cd4ec331b32534f3b08344a26415739
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing. The presence of embedded URLs and a 'download' button lure further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=papyrus+font+free++for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465264/normal_60080eb93bd07.pdfIn PDF document text
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/7563571.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412763/normal_60b5d3ebcbdf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481291/normal_5ff2dbea2c23f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_6041bca4800be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fc993ea9e5c0.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/wukefejimusav-pibisoxirepatun-papinoguliseze-neluvagagirusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5ffae7b79ead2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_60696e811a053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_605faad1d37c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_6038e3ff510c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485161/normal_6046c48341628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5ff46947e0e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_604f9540d013a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_60470c825f7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_6046319c80d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_604fc103d76b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448744/normal_6008043fa7e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_601fa0a2d3f5f.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/b32629e7-d158-4c93-850f-80a084bbb673/aplusphysics_magnetism_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c63c640-1e4f-4855-b336-40db1279f399/96569822299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427f5978-7cd3-465c-8c9a-26e2b10675d2/geronimo_stilton_books_online_purchase.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 5104 bytes
SHA-256: 6e1d723b84e8a28d3ec64a6312f2078cb2f193714120cce3c7e24e5cb4156378
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10708 bytes
SHA-256: 443715f1480020aaefdac96b72dda6c44d50f89ca39c46ecff2fe14d9de78da7

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