Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee2cf993791d316…

MALICIOUS

PDF

91.8 KB Created: 2021-09-16 12:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df15b48c136e60040476d0afc869ac39 SHA-1: b024118eff72b95bc3f0b465008199a1afb96bc9 SHA-256: dee2cf993791d316f8b4d1c98c3ac276d313cb2094f7fd88dca9a492e1c94566
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

The PDF contains multiple heuristics indicating malicious intent, including a fake CAPTCHA lure, an MFA harvesting lure, and a callback phishing lure. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external URIs, many pointing to disposable domains, suggests a phishing or credential harvesting campaign. While no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to trick the user into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=how+to+hack+android+by+sending+link PDF link annotation
    • http://alexlunacoach.com/img/editor/file/55792481661.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/zosefidabapojex.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/dujokofafobimotunejar.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/ruxumumesupafosovirumalib.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/91855595481.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/texamegazupenunaterisufon.pdfIn PDF document text
    • http://baove24h.info/upload/files/44332058856.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/433204919.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/22653149896.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/duxepifulafasa.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/46301954455.pdfIn PDF document text
    • http://pjteam.hu/uploads/97526494719.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/japunidinaz.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/xozapoxagipudirusoz.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/6504610335.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/zuzizatuxoj.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/jisujunaja.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419d321b8f5---39499014959.pdfIn PDF document text
    • http://espwireless.net/uploads/file/fagufobedibevufujeriwepab.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/judegirofe.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/wisotogumokilewovuxibe.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/71192515562.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/lakuzubuzokofazel.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/girabosowiwajogamu.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/sapugefogufoti.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_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 11072 bytes
SHA-256: 53ceb9d723634dfab6baacf8525305084171a3fdde123926592792fd7e6e67c8
font_01_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 18392 bytes
SHA-256: 5305b28d60bc070fc7bff387e87f85f31225dbf8504c86cab09296540974adfc
font_02_sfnt_off000149b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.