Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a65ac8b38a6b17d…

MALICIOUS

PDF

75.1 KB Created: 2020-11-25 10:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 74833a123f4707d0b54cb6b5e7efaf6a SHA-1: 2dcb732e957764df730aedd9405f50177a755321 SHA-256: 1a65ac8b38a6b17d087e9919f3d2ae2896838050d3e1beeadea6f816da1b11fe
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://traffset.ru/123?utm_term=chaos+impact+yugioh+price+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f95aa79b39a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_5fafea86cf411.pdfIn PDF document text
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/xizobezomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_5fa91ee974f16.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/d8d72.pdfIn PDF document text
    • https://vunuvuvoxi.weebly.com/uploads/1/3/4/8/134889930/9181988.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/wevaluw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f8abfa708337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5f993387b0b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5fb8a87103248.pdfIn PDF document text
    • https://xafuraworeduvux.weebly.com/uploads/1/3/4/7/134752052/e5061e6309f49.pdfIn PDF document text
    • https://sedanafijokam.weebly.com/uploads/1/3/4/8/134888359/271825.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/2bcdc4bd-f738-4e9d-a3a4-feea312f8e18/dewupaxukinisufiwefesenaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a66c508-3a43-499b-b352-30d375068a05/glencoe_physical_science_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/3d_cad_library.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_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 9488 bytes
SHA-256: 66312467f835b9f16ccee152064cd5402ad165b4d1e2277eeae4bf120c18edc4
font_01_sfnt_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5460 bytes
SHA-256: 38d716649d4388f96719874042ef14f13cdbca1bd955f7cd0759f6fa59454463
font_02_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 10396 bytes
SHA-256: 1ce6e45590101c1bd68a3719af69fed6cf3f2fa37d50b2edecad9a5cdaa3b4ca

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