Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cc1fc074c88f9f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 15:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 57ba23db3cfd20f96369348bcce99c18 SHA-1: a2685d437392fd488ae408fca57882facf672822 SHA-256: a2cc1fc074c88f9f8d1757a18178999b30987cc243f0084e12845bd327e7f050
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination, with one specific URL suggesting a download for 'talkatone'. The presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=download+talkatone+latest+version PDF link annotation
    • https://jagamimpi.com/contents/files/jopunadase.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210905_014841.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f823573529---5833807577.pdfIn PDF document text
    • http://mobil-tech.com/files/vadibikez.pdfIn PDF document text
    • http://altinay-law.com/images/file/46461344983.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/91725715181.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/mugafigugezuvesijewamoda.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/rofiweso.pdfIn PDF document text
    • https://kar360.com/resimler/files/lopasuvigunonuwapukegal.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109132109325141.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/50171049338.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/95615304622.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/36419055314.pdfIn PDF document text
    • http://webbuilders.com/files/file/xebaz.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/73459668317.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/85283097739.pdfIn PDF document text
    • http://sdes.in/uploads/gozowonono.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3c37a220---6319497076.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/febewewatikuxexanafavele.pdfIn PDF document text
    • https://flomogroup.com/upload/files/jojakegogamerozisuw.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/lugotajusoji.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/90634476155.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/7132953127.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/falewatabagasij.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/44990045484.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 10488 bytes
SHA-256: 2b5cbacc30f35a3555885c94ea1aa1bd7e229beddedcc7efccfc245c9f1c12c2
font_02_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 17920 bytes
SHA-256: 9389d32b1cbaf48e9472247e8566b46dcb212476a4136fba0f394add4487d01f