Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b67dffecf3ba6c…

MALICIOUS

PDF

77.8 KB Created: 2020-12-27 06:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7cb2b45f38450e9be36a584d8d3f57be SHA-1: 1a3a00b02ba946f93621be106747500c19ffec41 SHA-256: 90b67dffecf3ba6c919213da8a6873c3134c5fbda3a1d561908563fca311613f
156 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 0.9996

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/123?utm_term=zombicide+green+horde+painting+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5fda2aa0a7c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5fe7f5c69cd6c.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/gd1IhaE/bloons_td_battles_unblocked_games_77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449014/normal_5fc84484eefb5.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/lojawexorabes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f9699524a3bb.pdfIn PDF document text
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/sazulotazom.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/543833b0-25b9-4311-b26e-3c7fcf71ec40/you_can_negotiate_anything_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18103bb8-dd15-429e-a50d-b0f5abaf7ab6/anaheim_ducks_account_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53c8d15-fe8f-4959-b16c-b11ce9d444fa/kibenebuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f074d176-f73a-42a5-a435-d96c35202d79/ybu_ihsan_tokta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f967332-af52-4f5f-88f5-f9c0817c2552/times_tables_rock_stars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d5d143-69ae-4003-a828-1e53706c9c28/rarelixugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28835ca-ad72-4e4f-ae5a-a75e691d20b0/halfway_down_the_stairs_family_guy.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 5372 bytes
SHA-256: 45e31b3eb5a76195cff66ead2f963616930e279ee189de62f4269e532d5bee1d
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 2116 bytes
SHA-256: 89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e
font_02_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 11344 bytes
SHA-256: 236ff6610da087dc7c3ed75f08aac967595364ec4f21c1e5f12f49c0f3481068
font_03_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 16088 bytes
SHA-256: 482b7b4fee51162e6a5d82ff10b0db2f6da6482a74a1be5a66137bb6d850bf40

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