Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6ce653519f9c08…

MALICIOUS

PDF

86.4 KB Created: 2021-09-14 14:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 161f7576aa6c6f1f747a4d85a98f73f2 SHA-1: eb9ddc09c044aa47e41659af0d397f5f9fa5fad9 SHA-256: df6ce653519f9c081d57b637395ddef8839bc31efc884add0f2d9efb566e6f22
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and contains multiple external URIs. One URI points to a raw IP address, and another heuristic identifies the PDF as a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://rayanchem.com/d/files/sogowamofafevipo.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/kezepu.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/fodutevinomu.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_EEDD95F4051F1711.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/98892861957.pdfIn PDF document text
    • http://perksys.com/userfiles/file/50154951431.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909124532.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zefuw.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///nazaveporisasefogakisexu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/cd651323dd0ecbc3bae469e288f42759/xobedufomovinugijibag.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/5437298312.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/kupijubuxedinazofadekaru.pdfPDF link annotation
    • https://taechoclub.com/FileData/ckfinder/files/20210908_B1E7DAF337612DC9.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/boserefepaxibewiki.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/41174495578.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/fewavabenomimemef.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/tatejejonavejerimobowisa.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/gefadubavudijugisazim.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/lojatatitujeni.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/65636725521.pdfIn PDF document text
    • http://klaaswester.nl/img/file/vefugibovusabutekivafek.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/75022596538.pdfIn PDF document text
    • https://laser123.com/geektic/files/67057027667.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2bcf22e0---70659146927.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/zenaxemaboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=easy+b+chord+guitarPDF 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_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 18128 bytes
SHA-256: b9fb43ad748626d6c23174572dc17ab810d87c3dd937b085d0456b1e88119ef6
font_01_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 10704 bytes
SHA-256: 624da0533c8f0cb20b43239d4671cc0e8d9006a11b2217836d98a26488279378
font_02_sfnt_off000133ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1