Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e8e502d401698a…

MALICIOUS

PDF

66.7 KB Created: 2020-11-13 16:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 868bdc8dc511440f017f2931a1f7a7e7 SHA-1: 1633dcbb03bf59e19a9a51a8ba5dad13b95f17a0 SHA-256: 90e8e502d401698addb733a373eea9ccadc210c88f0736ad78214e41297e8fd4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/strik?utm_term=mantras+para+la+salud PDF link annotation
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/8850619.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/939d265826b9b.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/newijugapavu.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/d1f1d7cef64a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5fa77e797d059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5f97e85498292.pdfIn PDF document text
    • https://zenunokiguwa.weebly.com/uploads/1/3/4/6/134614978/12b43.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/3951674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f96d7802ebd3.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/bugutaj/93175381968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e8bdbc-40f6-48b6-806b-9f9578cbcd03/10216924488.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/38480132584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be098ac-7210-48ad-80dc-9c3884e2dca8/42284787338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86629b8b-d013-4a2d-beab-3401f50e3cec/pojademizemedomareva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8fd2b9a-104f-41a6-b353-544b81506b09/195566310.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_off0000c939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 4960 bytes
SHA-256: 8fb81c54090aada32180d0199059161a3bd54468d532f4e3738ba406cc8e2fed
font_01_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 10636 bytes
SHA-256: 9ddfb4620fd2c0855dc52e0af5a9a97112ada8890b90d2b031acd6f45bb42712

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