Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39584951cb100a1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-22 14:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3f32bf88411d103807bf1af08ff1678 SHA-1: d35b3e21ff773e579f1d97aabf2f3499cc68faa8 SHA-256: a39584951cb100a1f689ee7c97c81a1856183f743ae0434e4618538fbf5f47b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 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://crysiq.ru/uplcv?utm_term=ataque+al+prisma+apk+gratis PDF link annotation
    • https://diedacorporation.net/freesiafiles/file/34075422282.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/benofijawok.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210922150617.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/daribufuwusafijuga.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/45673105280.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/tumawasowileporavalizoto.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fadovetukudorase.pdfIn PDF document text
    • http://rsst77.ru/upload/files/58795981811.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/mototuviwopafatuvapisuvu.pdfIn PDF document text
    • http://maidichike.com/upload/files/12603447375.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/japazijukajedogukejavukew.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/75499032566.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mesutoseramixinaruna.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/xeluwebukijuk.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/30950975208.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/66285641007.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdc8bde936---92422890534.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c2ef795143b36319bcffe79fed799b3c/nizuvabewuseziraxobex.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/faluxigitofojanotumop.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/fuzatamesimorudagelo.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/97043453149.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/razebomu.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/29778963478.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/51247553846.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/zotazatujipomafamelovuma.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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 10692 bytes
SHA-256: ef89dbcafa2c062b93691f0e333ea12a08e4ea6625dd5f2a0e31419fb010010e
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 15376 bytes
SHA-256: 897bd8f8a9b57deda2bec1d1a876bce07f9dcacc9f73c81375ac983c0f2b0752