Malicious PDF — malware analysis report

Static analysis result for SHA-256 919da1fcbe513874…

MALICIOUS

PDF

85.3 KB Created: 2021-03-29 15:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 941386727f21bbc22364274b301d4d0e SHA-1: 39856263844dcd8c822ded5ed3409a062873fe40 SHA-256: 919da1fcbe513874cd0ba2e750085df39c5dfad32e799da53720d3d5f89df40b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large link farm. The ML classifier also assigned a high probability of maliciousness. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's designed to host links rather than convey information. The primary attack pattern involves leveraging a link farm to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=automatic+transfer+switch+pdf+%25D8%25B4%25D8%25B1%25D8%25AD In PDF document text
    • https://cdn.sqhk.co/muwitajo/bXghhhR/flashlight_taser_wiring_diagram.pdfIn PDF document text
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/pexul.pdfIn PDF document text
    • http://fubogabosurek.22web.org/uc_browser_apk_android_5._1.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/zovazexuf.pdfIn PDF document text
    • http://gotedez.22web.org/xupelif.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/fLeecFw/guess_the_emoji_movie_answers_level_38.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/e07826c0-9d2c-481b-a56e-db152f408bf9/zurozisanokimivulujif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833bb9da-be58-4c1d-bf68-a24520877052/14_pasos_en_el_proceso_de_investigacion_cientifica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc363841-0882-4eb0-aef1-f446feb7b242/44190634508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a52894d-eb71-4725-836e-dd66523bc2e6/zerabariralo.pdfIn PDF document text
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_3ea54b70cd4d4f82abf53e178ccdb293.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_0a18b834f4ec402080577d3e5fef5ff8.pdf?index=trueIn PDF document text
    • http://lumaradidufil.epizy.com/boating_accident_report_database.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfd03e8-150d-4890-9450-88349e93049e/is_the_film_the_king_based_on_a_true_story.pdfIn PDF document text
    • http://rikukevez.rf.gd/what_does_tu_eres_mi_alma_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd7ca72-d159-4ed2-aecb-e8867976638d/zejofaniva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fef9fa-92fa-4125-9bee-c0fc0309bf6d/benesejuluven.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_64b6dddce6db4f5c897f9d5a3a85e0e4.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_d4917cf363d9479da9169f51ff4ed960.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f71e24c-e878-4f0b-8ba7-4bf5cacfc365/8570343443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a88443-7243-4cf3-b246-1bca9d424cbb/the_urban_farmer_richmond.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_c45579f2562c49249ebcf49540fa717f.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 5444 bytes
SHA-256: 863741ba0752c37aa39dca5d09332ba98303aa1e6f60e9337c48d16716a9c73f
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 11468 bytes
SHA-256: 75b7e2e8df2a1664e64104dcb175015ac8c7fa00138df1c68865f58f915abe0b
font_02_sfnt_off00012e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E98 16476 bytes
SHA-256: 2b1091462c6479ac4851f225ce2696f8817a64196ca0cb1bbfe3c5794c93fea7

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