Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b35ff8881541cbe…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 14:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 519ef3e80aecb3912642b6e0f308f376 SHA-1: f91bb2d742fa4774dca79fc0b45f3638661d4496 SHA-256: 9b35ff8881541cbe86c7dd19cb1e9dc835b5185fc5e1ba01c2deab0c9a4cc89f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with a high heuristic score for callback phishing lures. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to potentially compromised or malicious sites, suggests an attempt to redirect the user or host malicious content. The SE_CALLBACK_LURE heuristic specifically indicates a pattern consistent with tech-support scams or phishing attempts that rely on phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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 http://mimarkamilozkartal.com/userfiles/files/vidojexurotagejexevesi.pdf In PDF document text
    • https://unibel.pl/pliki/upload/file/84982436926.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/wemepepiwolodinul.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/2126862299.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161447384b6d06---nagerifipoberitor.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/sofinuxevojepemix.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/kitojaketuxegikusivikixas.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/24168809529.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/rerafigonopefizif.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/3260138414.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/25178401531.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/51297672655.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/19760589483.pdfIn PDF document text
    • http://simoncaulkin.com/images/38268553345.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/jitisonanozolalotu.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/51760432221.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e868cf5c52ab45ffd7d3f6465c076406/23764973060.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wijetuzerexajevurixosulaj.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/zivawinotonetexozoziw.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/komifoxeripi.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/fuxozuj.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/jotata.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/14183663376.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/11428750800.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/sokobovimidegagirematoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=six+guns+mod+apkPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/54016832670.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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10728 bytes
SHA-256: 04f43c48beba51f0aec466be0b30e079fd40834741847a925c080dfa206044e8
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 17492 bytes
SHA-256: 83ab30ad70d864c726ac3d69329f963a30fb9f49c44621a22d37e6cc44070a3b

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