Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac237856024d474c…

MALICIOUS

PDF

115.7 KB Created: 2021-04-24 14:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38127889d4b9a455ab620d2b54592080 SHA-1: deb5a5e92e32c92f24acf5fcb4a2c32c2a8da1f1 SHA-256: ac237856024d474cb6d2996dec1c9facaca7bd28e9030cc9868b8303da03a8d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=john+deere+4045+engine+injection+pump+timing PDF link annotation
    • http://ital-tess.space/hp_laserjet_pro_400_m401d_specifications1i4vx.pdfIn PDF document text
    • http://trells.space/are_equate_meal_replacement_shakes_good_for_weight_losscqry7.pdfIn PDF document text
    • http://moviesaddaa.online/657114230025lfjy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fcfedd4e5d44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365653/normal_5fca83c57e7bf.pdfIn PDF document text
    • http://ver-alex.website/554301709119ij57.pdfIn PDF document text
    • http://hookup756.fun/sezupiluzulawidu8jt42.pdfIn PDF document text
    • http://elinekici.online/the_lying_game_tv_show_netflixrd8qt.pdfIn PDF document text
    • http://want-seo.ru/steel_bar_weight_calculator_onlinedzizd.pdfIn PDF document text
    • http://perfectiona.online/birthday_book_astrology_personalizedt2sxk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377678/normal_5ffe1dc8b38c8.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://uploads.strikinglycdn.com/files/41a00507-dcf7-4440-bd86-b4e9c86dc90d/primeros_auxilios_psicologicos_ante_el_covid_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15204e78-5212-4f3f-aa93-ad5aad671ce7/discover_the_power_of_your_thoughts_and_words.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_c90397c489ec4e8dadbd8ba0348bb3e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da9facf-0288-4033-9b92-1b4fa784ea89/how_to_install_spectrum_app_on_apple_tv_3rd_generation.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_77bf98398bd24dde8fbfc2cfed2faf84.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_a6ebc67afb63432a9d96ca3740f23403.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_469d4ea1ab0342a4b6c5a0390b9c8167.pdf?index=trueIn PDF document text
    • http://muvuferoditewum.epizy.com/nist_blockchain_technology_overview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9540ff56-14d7-4cbc-9d57-34ce0f11c52d/vipitejudowudigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9110503-da5f-4bb8-8775-84f7ec0a7e4d/alone_together_cast_lizquen.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_19463ff99613420fb4ec04310e77da17.pdf?index=trueIn PDF document text
    • http://zawuzujuw.epizy.com/under_armour_curry_7_performance_review.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B55 5368 bytes
SHA-256: 0b2bdd6e94c7fd8718341bff816d484bc8dd2c9b2ecd82b7c1ffdc13e55f117c
font_01_sfnt_off00017d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D6E 2328 bytes
SHA-256: 1ae1185155da274b67610498fb1cf940257c826f078c1a9e0eee4eed91ad577f
font_02_sfnt_off000187d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D2 11928 bytes
SHA-256: b14bc10eed3aab5e9f52086f94bf3be7289a3e79243164a9a73a24933501f6ce
font_03_sfnt_off0001b075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B075 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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