Malicious PDF — malware analysis report

Static analysis result for SHA-256 6799dfa9c0f42115…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 16:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 011f90f91b8ce6058d1e4ce5b1b99e16 SHA-1: 5fe6de2177655fe7f8be99863b050ed821fbdf45 SHA-256: 6799dfa9c0f4211525474211f8786a09a10130e7dc0694bdd86da74871c6d681
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the presence of external URIs and a link farm, suggesting the document is designed to redirect users to potentially harmful content. The 'SE_DOWNLOAD_BUTTON' and 'SE_CALLBACK_LURE' heuristics suggest social engineering tactics to trick users into downloading files or engaging in further communication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=omnisd+download+jio+phone+apk PDF link annotation
    • http://minhledtran.com/luutru/files/tirefogewumogusinapoloba.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xigepanevuzo.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/67172761539.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/38334938024.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/92681535715.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/liduxafavopagobosexup.pdfIn PDF document text
    • https://btegypt.com/file/5883148834.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/42809008573.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/lemidipalejokilinotan.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140bcfe65392---80096268542.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/bomijezotuwazetefuba.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/91622542620.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/87150369209.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/kalagesumeral.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/nixogegorivibunakodepepub.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/87355473957.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/43578842399.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/roxol.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///kunetobenutinufubeg.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/8894420547.pdfIn PDF document text
    • http://cx-gl.hu/images/files/31029378139.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/55760552380.pdfIn PDF document text
    • https://insp.biz/img/file/jusufikotamazulugerim.pdfIn PDF document text
    • https://senegal4d.com/contents/files/firirikuxewevilewopi.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_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 10792 bytes
SHA-256: f2b4f794ba33e78fe24744c1eec302f847aa27cce2a7f16b88fe867348c905ec
font_01_sfnt_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 16780 bytes
SHA-256: 4ae4bcf55020481afbd3b6fa58056a59950a90de632a9db6cbd1af402f7b9ab0