Malicious PDF — malware analysis report

Static analysis result for SHA-256 80953b5b72166987…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 17:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90a99ad23d2a08097f5d9c91583ec549 SHA-1: bb122ae59a0b41699d9475651fb4f555654f01da SHA-256: 80953b5b72166987e830df602b5f1e2714c7e3a8b3a5f0efcf07c4529a20e0cd
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to host malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful content, likely for downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5d25ef9665990edf7c0d813468a6899b/tezopupevudekalewegas.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c0fea252---89487818184.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/fekakewigakel.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091706164292.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/33694232338.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/8519649584.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/60243761994.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gigoluka.pdfIn PDF document text
    • https://kawanmto.info/contents/files/69901639626.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/88916683203.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/15900820643.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/58629896192.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/82353095214.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/72330987200.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210913140920.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/93875862671.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/kuvijosaxaludexafiri.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/84711461214.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/62756484685.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/kaxisenumulavelapo.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090916265847.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/bopuwelewenixirod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+iptv+for+firestickPDF 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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 17824 bytes
SHA-256: 31d56340a1c8d2d3098c83757fa60f8cd0314d3a44cb6fa8d083d12daa141f6c
font_01_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 10296 bytes
SHA-256: 8ac7887bba44b4039e55eaf6253a4dad7e7df20f8a695aa50176bcd1bbfde0d3
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1