Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d3b28c5333b999…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 13:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08d07227aa05413c770081989c6ce487 SHA-1: 5f6c0fd8d97d03ea62f2436e753d1943d4a63e71 SHA-256: 16d3b28c5333b9996b8955fea3d5a50f14b1bebb79967f4c6cdd61b3990a232c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=watch+inside+out+online+free+123 PDF link annotation
    • http://traviet36.com/upload/files/43997403059.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/47795581692.pdfIn PDF document text
    • http://glassick.com/userfiles/file/botajakefolasugigunomin.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/6161411698.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/pevolazan.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/povinebawivopisawa.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/88391982665.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631764262.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/felivozatodikivesifusiwo.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/37055490309.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/pabifoxatajepu.pdfIn PDF document text
    • https://10fci.org/userfiles/file/lizajimujidijuxunakatiri.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/vitovepavavota.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210913_3305D9C497BA9F45.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/41805896928.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/27957597643.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/62986318030.pdfIn PDF document text
    • http://robbes.nl/media/files/41637468699.pdfIn PDF document text
    • http://yuha.be/_files/file/zerafikamasevuwivaruzil.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/12315010025.pdfIn PDF document text
    • https://semut73.com/contents/files/45318377869.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/51780863848.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/8usrh1o8i091gqev14vbm8qgt9/kunumerobiguro.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/jisebuxegajuvotowemota.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/20541084131.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://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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 11012 bytes
SHA-256: 7c15d73a78dbba806d80fe12ada6e8418155e8eb042247b45a0ee4538e823134
font_01_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 17876 bytes
SHA-256: c0c18775363dae32cac42e1c53a9e240d9e0fe0c2e3e5330c7769aa04513f84d

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