Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0563fc9d261b55f…

MALICIOUS

PDF

96.3 KB Created: 2021-02-10 19:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1cc9364cbde6a65de2f03908ac65c845 SHA-1: 0e0bd25a63997a11c57ca77359ddd38a8c850fd2 SHA-256: d0563fc9d261b55fb262a176be806ce626cd614cf2d8b94f08087d850093c4b0
136 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI and an SEO redirector link pointing to 'https://baarspo.ru/123?utm_term=letter+of+instruction+navy', which is indicative of a phishing lure. The document body, though heavily obfuscated, suggests a 'letter of instruction' theme, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/123?utm_term=letter+of+instruction+navy PDF link annotation
    • http://byseles.xyz/698727043936j02v.pdfIn PDF document text
    • http://car-test.pro/pixel_knights_apkqphrw.pdfIn PDF document text
    • http://shoop-fm.ru/rekevituxukepanudejamsrlm6.pdfIn PDF document text
    • https://cdn.sqhk.co/liredubi/cd9WBbD/89252423453.pdfIn PDF document text
    • http://ritixabig.iblogger.org/61846219034.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/wdIidGK/hyper_heroes_marble-_like_rpg_mod_apk.pdfIn PDF document text
    • http://swast-group.website/limites_usuelles_des_fonctions_trigonomtriquese4pxk.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/jggihev/nikana_prime_vs_skiajati.pdfIn PDF document text
    • http://detonic-shop.website/fha_amendatory_clausexleu8.pdfIn PDF document text
    • http://yoga-italy.space/57129091371gtfzz.pdfIn PDF document text
    • http://9gusevshop.website/90517333414wt5y5.pdfIn PDF document text
    • http://fixebojamofi.iblogger.org/anonytun_for_pc_apk.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://s3.amazonaws.com/fekaduvopigab/17846317326.pdfIn PDF document text
    • http://zunebodiz.epizy.com/vatujerusasomisowowu.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/mifewudunosuwaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/beyonce_formation_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/integrated_chinese_level_3_workbook_answers.pdfIn PDF document text
    • http://wetoxisifogif.epizy.com/22051618310.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_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 4828 bytes
SHA-256: 7cb5f73b462834662235db00a8100cb7b2d3af7c0ea01f19d25d03b3176f7413
font_01_sfnt_off00014091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14091 11092 bytes
SHA-256: d4588255fd0a9f0c314c642be142d16458ec40be6e28350c519f692aeef89b59
font_02_sfnt_off0001658a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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