Malicious PDF — malware analysis report

Static analysis result for SHA-256 8340f854ef66aa31…

MALICIOUS

PDF

84.2 KB Created: 2021-04-29 22:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a9c1ef3d0cbb33551f389b80eda0f865 SHA-1: e33feef47ebd598254e6bfb216279eb3c17790f4 SHA-256: 8340f854ef66aa31018964042d4cf5d2c1d2a3e8584eea07cb8bcd5dd8080dce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure for driver downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=focusrite+6i6+drivers+mac PDF link annotation
    • http://private-channel.site/guidebook_app_download_for_androidhss38.pdfIn PDF document text
    • http://neuroncraft.online/617527032578mcxd.pdfIn PDF document text
    • http://feyakast.online/what_order_should_you_read_the_rick_riordan_booksgs407.pdfIn PDF document text
    • http://domsale.xyz/who_is_the_most_evil_character_in_king_learmlc8n.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/bhd99w5/bow_mania_apk.pdfIn PDF document text
    • http://circulyarkadigital.xyz/how_to_do_scientific_research_in_high_schooll2b7q.pdfIn PDF document text
    • http://kemedejovon.getenjoyment.net/aromatic_chemistry_book.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/gcEh2ja/37803289486.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxibovesiva/ADoggih/metropcs_4g_lte_speed.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/pepakeduga4col.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/hhfhgF8/68822211071.pdfIn PDF document text
    • http://adachivia.store/84064317571b5xar.pdfIn PDF document text
    • http://trackengine.host/juruxiko20vai.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/gPjdibN/75210004209.pdfIn PDF document text
    • http://milanbeach.fun/letter_to_my_nephew_james_baldwin_analysispqogj.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/talk_yourself_into_it.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/fet_amplifier_experiment.pdfIn PDF document text
    • http://fito4ka.xyz/93836678692831ho.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe5a137-e781-44eb-922d-1e2a53da5800/samsung_galaxy_tab_4_7.0_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a244386-440f-4e08-9404-799ac542764a/john_deere_345_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b887d79b-ea1b-47ce-908c-8fccb3e097cd/66788675121.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_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 5224 bytes
SHA-256: 1c082fd32b651dca9d9dd0f8a29aeccd973fe4eb735f8aca60e9ff8c70b47862
font_01_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 11180 bytes
SHA-256: 4fc6f5b4cdafee9e10cb72551f55e6ae432b2cc92d97b491ae946d1283a16747

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