Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ea452799f2c21b…

MALICIOUS

PDF

82.5 KB Created: 2021-03-24 23:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c4ba355122e22c954d55eb6ced29dc68 SHA-1: 283525a754b3ac83d3ccd70aaa361175839b6d88 SHA-256: 15ea452799f2c21befd21e0c927249119ce03060be33ccf0e6afb4dab3d4e9f2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains keywords related to 'Crossfit exercises guide pdf' and application metadata, which are likely used as lures. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/award?keyword=crossfit+exercises+guide+pdf PDF link annotation
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/6971232.pdfIn PDF document text
    • http://gelivebun.22web.org/nazamimu.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/uibjcWs/affinity_photo_mac_free.pdfIn PDF document text
    • http://goods-amzon.com/36162421522mand2.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/how_to_write_a_mystery_storyjg9td.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/icpiigh/minecraft_dungeons_hero_edition_xbox_one_release_date.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/9976898.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/gciaThj/pentagonal_prism_has_edges.pdfIn PDF document text
    • http://huseyincanx.com/rufuvenaxadjv3xj.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/wl0frjb/84851020440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapobek.epizy.com/mild_form_of_gastroenteritis.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/tavagatado.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/38856401188.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/mba_cet_2019_form_link.pdfIn PDF document text
    • http://xatabiraluxuded.rf.gd/perimeter_of_a_circle_free_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/86503990106.pdfIn PDF document text
    • http://bupelasupur.epizy.com/the_reason_is_because_redundant.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/how_do_you_find_the_angles_of_a_trapezoid_with_side_lengths.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/fce_open_cloze_exercises_with_answers.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_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 5052 bytes
SHA-256: 56d6983b30acce72fb0261e1a1c9fcb45af7eccd75380e7597a56d501ec80523
font_01_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 10840 bytes
SHA-256: e6e4932cf525b05cea3ec44a38afead67fcb0392840de57174fe7fb956e74716

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