Malicious PDF — malware analysis report

Static analysis result for SHA-256 f149706ce332ce1c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-10 02:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 440a73779cfd075770fe69551950fcca SHA-1: 4ec7c2545acf3dbd531e58edfce04453d92672d9 SHA-256: f149706ce332ce1c150e761b0cbe3146b36219ccd68974bb34e3408a5670d777
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous links to disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://blugarden.eu/file/wotifazoporab.pdf In PDF document text
    • http://fbrasil.com/userfiles/file///89321982898.pdfIn PDF document text
    • https://tekartltd.com/upload/files/75537006297.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/34978816725.pdfIn PDF document text
    • https://12waktu.com/contents/files/64540834448.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/73496641660.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_C6A7111F618A938F.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/woduledejikafomumibup.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vuwomubunowozotewosaleve.pdfIn PDF document text
    • https://phnews.ro/files/file/93130735327.pdfIn PDF document text
    • http://pedraferro.com/files/files/49700737006.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/vaxuzezagefupofarol.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/515745369.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/11478750553.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/kosukobobiw.pdfIn PDF document text
    • https://equimat-cheval.fr/file/foxigaxobuburizupatemu.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/26656692817.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309919d1129---gegemexufefi.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/vemijiwewobikewuf.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210907120017022963rgo97k9p8gxg.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/buneduferenibaxezusagux.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903061344172197.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/78014496997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+kick+apkPDF 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_off0000b8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 9900 bytes
SHA-256: 7b2892c7bf17c62e5db6e49e9a0678b67b9e86ad7fd147857e335a76e5e0ee7e
font_02_sfnt_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 15856 bytes
SHA-256: 5a363f1d9721384ab86a11a91c44b084886c354cc55a1c00aa29a3c9d41f5aa0