Malicious PDF — malware analysis report

Static analysis result for SHA-256 649781e80d780209…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 17:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f011c8d98c64f438db76f5bfb61af57 SHA-1: a5feda9bb37d7f2d641620b62ea954737e8676e2 SHA-256: 649781e80d780209d60ee1d4676876f3c7825e6eba271a0bd1e5ebda919f84c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://iacsglobal.iacsinfo.org/content/uploads/files/82027557784.pdf In PDF document text
    • http://scuderia512.com/js/upload/files/21040514862.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/66484377962.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/kevivonixinogubudaligajid.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/vexomaritezuw.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6357162608.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/52820114685.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/79243130001.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/86971788398.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/ginina.pdfIn PDF document text
    • http://japhina.com/upload/file/loraxefegoxajafuses.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/voket.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/84988159452.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/zogibipolorapirif.pdfIn PDF document text
    • http://orem.mn/uploads/files/tapemi.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/tuzapukexivozirovidowajet.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/zapuxem.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/25498600755.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144430a4ad25---purinepadixu.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/10804613777.pdfIn PDF document text
    • https://htchninc.com/d/files/94799839731.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210909_121127.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/befomarewuka.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kenaxewugitoneriwatavev.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/64899170439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+adb+in+windowsPDF 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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 10412 bytes
SHA-256: 73134ab89c5dbf9b6c874aae52553d48613f4cf37df06ab7570f3bf5b50b940d
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 17524 bytes
SHA-256: dc07d0204fb33801d2fe76c96a3598b12788abdf8ef334e9bb2c8025724de79e
font_02_sfnt_off00012be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1