Malicious PDF — malware analysis report

Static analysis result for SHA-256 42168f4fdb39e271…

MALICIOUS

PDF

82.6 KB Created: 2021-03-30 18:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8b5f1304385c7933309c36cb4a7a0b89 SHA-1: a065531c5f06f59834b6aa726863e21466bc91e3 SHA-256: 42168f4fdb39e2716b5a22a7796a7ef8a8dbe3a4dd92b5cf2649e1aed4166ba6
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://leonvi.ru/wix?keyword=cat+clicker+game PDF link annotation
    • https://cdn.sqhk.co/buzulexoxuve/jjlgghi/99644040000.pdfIn PDF document text
    • https://cdn.sqhk.co/widobixi/uGuiajd/free_calendar_template_australia.pdfIn PDF document text
    • http://goodxday.xyz/cd_format_windows_7ghah0.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/cobs_bakery_nutritional_informationkiy2q.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/Rgjha4S/xejona.pdfIn PDF document text
    • https://xasezufud.weebly.com/uploads/1/3/4/0/134016907/darolokimajudu.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/jieihh0/4453061850.pdfIn PDF document text
    • https://tepaxomiro.weebly.com/uploads/1/3/6/0/136019937/fimunifowizukasad.pdfIn PDF document text
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/9818180.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/mathematics_for_economics_and_business_7th_edition.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
    • http://leduvusiluvev.rf.gd/nobulixuwudo.pdfIn PDF document text
    • http://fagesoletenuku.rf.gd/dafaxiniriro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949a8dfb-de8f-49e2-9034-bc37adb3eb9f/xufamanawiguforiz.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/rocket_propulsion_nptel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c23c7e-3d85-4012-b681-1b488076a006/34571473060.pdfIn PDF document text
    • http://tafobinememen.epizy.com/nikon_d5600_user_guide.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 4600 bytes
SHA-256: bf0d416b1383b0d288c5288e0be79e82699decbe26c2196764387a5deca9577f
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 10928 bytes
SHA-256: bc23b6bcd785b55ab75dc99bfd761af8bb9bf915bcd172e2002a3d1607f2f247
font_02_sfnt_off00012f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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