Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a0cbcb439cba7e…

MALICIOUS

PDF

44.2 KB Created: 2020-11-08 20:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f1f76c17aaec619fb60dfff6fba02dae SHA-1: 1c55bc96d639985cf98df119956503e5b76ed2da SHA-256: 18a0cbcb439cba7e45c4a9ecdece04c5938e06183d277c3209f9f5523f89447b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF SEO Link Farm' heuristic, suggesting a tactic to manipulate search engine results or distribute malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafftec.ru/123?keyword=harry+potter+clipart+symbols PDF link annotation
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/jifopelipulavojom.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/23757.pdfIn PDF document text
    • https://nipokilalupa.weebly.com/uploads/1/3/4/4/134485501/2163858.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/ratozegesigikova.pdfIn PDF document text
    • https://gakexuguzadeza.weebly.com/uploads/1/3/4/4/134401700/e77f48474.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://wimuxuxodog.files.wordpress.com/2020/11/32074510043.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/95171441989.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/library_lion_activities_and_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/barakhadi_in_english_to_hindi_download.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/sonuve.pdfIn PDF document text
    • https://buxefonatis.files.wordpress.com/2020/11/rajikukuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611891c5-2920-4737-b4e6-bf6f32c908f4/dapple_dachshund_one_blue_eye.pdfIn PDF document text
    • https://dutekosakiwe.files.wordpress.com/2020/11/wexajazigazug.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/jbl_cinema_sb400_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/wheeling_park_high_school.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_off000060f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F4 4964 bytes
SHA-256: c848f0018719a13733862c2058aeda90b1f6e7efe7cbc441470942fe65474aa0
font_01_sfnt_off000071d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71D9 10552 bytes
SHA-256: 56200eb6621f571570886dd7a72fb22c88a4945415faaeb7b2be05c455a28c96
font_02_sfnt_off000095bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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