Malicious PDF — malware analysis report

Static analysis result for SHA-256 6916cc6a2ff72381…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 15:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a27493000035a4cfab6418fc3ac7eb1 SHA-1: af4ceeb37b7618ba22096c263673f2558046bb8e SHA-256: 6916cc6a2ff7238189dd0ad2c0b3a5c009fae5fa3c812ec3034eb410e8ea237e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://gocoachfox.com/userfiles/file/badagepedevujevewun.pdf In PDF document text
    • http://warwick-ems.org/userfiles/file/fubizuso.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/vonarinomagunolamakiwo.pdfIn PDF document text
    • http://perfectsextherapy.com/public_html/userfiles/file/56206544104.pdfIn PDF document text
    • https://nyig.com/files/file/43781789480.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/48921835218.pdfIn PDF document text
    • http://canadianrockies.info/files/file/30114778535.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/mibuvumegunefakipo.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/73301807714.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/14516204177.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/gupupojuta.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/dinonevaniba.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/5262785875.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/mexawateb.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/5673066933.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/18516216854.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/41030767937.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/nedibulubepizuzam.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/3068522054.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/babowerusodoxebo.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/74101688027.pdfIn PDF document text
    • https://mashura.co/userfiles/files/67769046940.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/deledanavileroz.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4fa5b49e8a2478dabe469a8da053f24f/43991629378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=%D0%BF%D0%BE%D0%B7%D0%B4%D0%B5%D0%B5%D0%B2+%D0%BC%D0%B5%D0%B4%D0%B8%D1%86%D0%B8%D0%BD%D1%81%D0%BA%D0%B0%D1%8F+%D0%BC%D0%B8%D0%BA%D1%80%D0%BE%D0%B1%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 27144 bytes
SHA-256: b02c9e656a225ec37134d630d65ae2ac3c36131b6460a22371a650752e68fa4c
font_02_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 11700 bytes
SHA-256: ed842f6efef427e97a76f2cd9a4a66c39c2c4485003e4bb0fdb336498616f55a
font_03_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 16596 bytes
SHA-256: daf6718a7432285ef3f0f286b8dfd185c166b3de9bc72017c2d7a1eef01cb5b9