Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7745f41308436d…

MALICIOUS

PDF

57.0 KB Created: 2020-11-08 05:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b6753c012239a28b6b7b612ffee59cf1 SHA-1: d3bc6c58bf3159dbb4085d810a683b3d02b216e5 SHA-256: 2e7745f41308436d593b02ece6454721bd72cce825bb9944feafb12ebfdf8d81
134 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 an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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?keyword=aimbot+hacks+fortnite+download+apk PDF link annotation
    • https://sonuboguf.weebly.com/uploads/1/3/4/3/134310015/2357634.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/7220344.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
    • https://uploads.strikinglycdn.com/files/df776561-1a6c-4054-8808-d5a05cbe8283/bigutifarolugurezesasu.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/bulapijazuvifilejunoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84a918e-0ef2-4f1d-9c5f-1f0cc8b14d79/fitbit_versa_notifications_not_working_iphone.pdfIn PDF document text
    • https://mozedibeja.files.wordpress.com/2020/11/lofemudit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2f0dd7-3894-44e3-bd9d-18ee623d83ae/2601644498.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/hematology_tests_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe42318-b58a-4085-b518-323aa1e5dff0/99327960516.pdfIn PDF document text
    • https://xijadijuf.files.wordpress.com/2020/11/70973348632.pdfIn PDF document text
    • https://zujuvigewif.files.wordpress.com/2020/11/zomixawafofup.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c819f63-ee03-4b44-9840-e218f8ae04a7/kal_online_private_server.pdfIn PDF document text
    • https://vesofoxoji.files.wordpress.com/2020/11/c_programlama_dernei.pdfIn PDF document text
    • https://zigusewune733751328.files.wordpress.com/2020/11/fexikaku.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_off0000790c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 5468 bytes
SHA-256: 449aafc53f3b71a4e2ce46205aa64a9721b33d9466399d86977a37a88a3dec91
font_01_sfnt_off00008b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7B 11868 bytes
SHA-256: 5376c9b36bb592c0a11564e228c876924731bea7cb8e38958a7864ff3777d1dd
font_02_sfnt_off0000b323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB323 16208 bytes
SHA-256: 10c941b8e150654bd5064cadd75ea78825c9277c873182c21e5fbf45442fdeec
font_03_sfnt_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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