Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7683d900c5a3d02…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 18:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 526e4faec308c4c469335a0b36fe4e61 SHA-1: b2378e113514aa9a2dfdd93cfb24868c71c12949 SHA-256: a7683d900c5a3d029cce1701671e917bc4c3dd713afc444985ea8169bf6db9fc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a phishing campaign, likely using embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://sayarbobinaj.com/file/nugotuxirorixojuril.pdf In PDF document text
    • http://spokoino.ru/i/upload/files/76550020677.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/xirojidufugulogexev.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/28377991966.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/binotabovemuteba.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/57420067961.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/kubovimololawowop.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/53182625330.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gelowidedi.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/jowokexulopujanokemet.pdfIn PDF document text
    • https://theurbanthinktank.com/files/jalexebifidexurerimit.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/31753236689.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/famogimapesetulonij.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/95290185729.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/54256583635.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/46085497652.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dfshh31uc826ql3qe3clg3vcle/44350843569.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/berugiwipefegitomofix.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613c674e43d46---xexizowifoj.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kuvifapidalagisuxiwus.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/ruxor.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/93108732194.pdfIn PDF document text
    • http://centrons.com/uploaded/file/70421653261393d861afec.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+find+serial+number+on+android+tabletPDF 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_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 17304 bytes
SHA-256: 1d128c7b5d79c9d6727c4e1b7e41f9819c2c81110a4318bc6d495adeb85a81a1
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10832 bytes
SHA-256: a7e21ed09b19a8af697fc126a18f1e54ab8a836363a84533e0fd126ea180d0e7