Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fe6faff97b3c0c…

MALICIOUS

PDF

74.4 KB Created: 2021-06-08 05:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 09fb4235e91bf66f8ea4a8a8b89f96f6 SHA-1: e42ed9d1f3d010362c57e1bbf9fb1740060168b6 SHA-256: 10fe6faff97b3c0c5327a1e4dd5ef8bd507ba7ce118ffa217b2fae68ea358303
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://crysiq.ru/pbw?utm_term=how+does+qualifying+in+f1+work PDF link annotation
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/vuvitafeda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471488/normal_5fcd78877b120.pdfIn PDF document text
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/a81fed4db279.pdfIn PDF document text
    • https://katatowuli.weebly.com/uploads/1/3/4/8/134879603/1232883.pdfIn PDF document text
    • https://tetikofigutuda.weebly.com/uploads/1/3/4/4/134445118/5091134.pdfIn PDF document text
    • https://fexatawolev.weebly.com/uploads/1/3/4/4/134445796/2587b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_6041c247d76ef.pdfIn PDF document text
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/8045640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5ff82474a1a46.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/fcc59bab159ffc.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/bfa6df24-88f9-4d31-9835-738e8bfa843e/vezitememokerigu.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/call_of_duty_black_ops_2_mac_os_x_download.pdfIn PDF document text
    • http://radejaki.pbworks.com/f/tamitabaper.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144608856/pujokubukowazuwil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24842545-5080-4a3c-8c06-5af126857ba1/american_harvester_snackmaster_dehydrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032dfb62-3173-46f1-a9d9-f45a839ec852/mumexivemowadibanepodef.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/f/bodagobekabivat.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 5472 bytes
SHA-256: 81d0a54504b256e7c7ba4f598ea4b0879cf22adde29639273d8a7d39f5402558
font_01_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 11076 bytes
SHA-256: 798c2f7c42d5d7a41c375f98fbec98b90a198803cc6507209a417c008cca04a9

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