Malicious PDF — malware analysis report

Static analysis result for SHA-256 7676ac2b3a353bb3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 02:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20223090eaa66cc1a0cfc12cf405edd8 SHA-1: b920ce9e31fb4612d5cc7e021bbdf1458290a9f2 SHA-256: 7676ac2b3a353bb3b4c9d81381ed3a88aba26146d834eb26ca9528630d617108
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://khocabien.com/uploads/files/tulad.pdf In PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/1296162714.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/59942657971.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/85444647057.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/86068525906.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/tagisixowalasozedanoj.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/papalafi.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/65393721274.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8583206fc464bdfe62d75d7350861af5/59045984332.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/45069229334.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/35929806196.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/37849020291.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613879c0c6a5e---vimodonisizenitujud.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/36078819039.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/xivotunikudusujun.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/28478034705.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/56150061105.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/pekozejejurosudok.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/rebafavexewesamidakibura.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/suluwekoxo.pdfIn PDF document text
    • http://mastervin.ru/files/file/9693922280.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/sajunenarirutagalasinulap.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/dazexatolizetubadaxew.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/zawevewaxagapavunaw.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/61254360109.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/48185756564.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/tolejifeleba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=5+string+bass+guitar+scales+pdfPDF link annotation
    • 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_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 10952 bytes
SHA-256: 45d444633d3f51a91c0e2993d85e650d4b397e5b7da672890dc4465ce7f52e68
font_02_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 15524 bytes
SHA-256: 3fe9d88c0a98ac28db1e51636cc8f175eccff81d58325fcd3513f2798cb22c09