Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef1b0c23a6bc800…

MALICIOUS

PDF

75.7 KB Created: 2020-12-25 05:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 538e28bd8a092946cfad13bbabcd2289 SHA-1: e4cd1726a3dc636e328d408db7f68c8be618e9d6 SHA-256: 3ef1b0c23a6bc800886064fb848e7157797e5e78ef98bfb4b3b2c12c5e9f6226
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a generic lure message and multiple external links, one of which is flagged as a potential phishing or malware distribution point. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URIs and the 'SE_INVOICE_LURE' heuristic suggest an attempt to trick the user into navigating to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffnew.ru/aws?utm_term=please+see+attached+file+for+your+information PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375522/normal_5fe15c9a0804a.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/hcifphi/pubuxudegiwenosab.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/sutezosegado_ditisuwinebe.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/424d2d84adb956f.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/4hjLZmO/12359908288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/facebook_hide_basic_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f953abe-b261-4873-b1a3-f49859916d04/horse_care_games_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fb0039-fc4d-4ab6-ad02-b9b147e4c7c1/construction_change_order_tracking.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/bernabeu_digital_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f9623f-c315-4e96-9596-57423a524c81/89352016581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab1c576-c593-4150-b599-c4a811034606/ladezenuwajezagibegomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa1fa8c-8793-4ba8-898d-07e7c84e21b6/denemodakojogujinezisopat.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_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 5364 bytes
SHA-256: 790c48d1edb051017ae026e10f2ef2d8b8e2186e47ed10dd73acca27f9062582
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 15400 bytes
SHA-256: 4519511ea6b87e3efafc376401388e7244f9ab1277afd8950ebe7a0819dcfa5e

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