Malicious PDF — malware analysis report

Static analysis result for SHA-256 a531d85a740ab29a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 14:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfc1a87ac53c835cb49da7d21eeafe01 SHA-1: dab108559de7c0df9d2cb5dccd281e37af6c3392 SHA-256: a531d85a740ab29a7db9cb03ab746c6bd523b0a0d91799d90275bff88dcb0a03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting and use UTM parameters, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's primary purpose is to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=video+calling+for PDF link annotation
    • http://metaglas.kr/userData/board/file/12003559229.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/vajawikafulu.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/10917066167.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/65259487068.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/gixamajoweboxinixukemejok.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/gesikepizubid.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7d75036718a80b09b68fe964f5d4e840/14459400919.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/82168670538.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/duvufafe.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79862334989.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/12629891365.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/17349867708.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/ginoziron.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/55994792973.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/93220709421.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/nemetotofasezovavusires.pdfIn PDF document text
    • http://lagrupacio.cat/file/vibulexitopobupef.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/52443479804.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/42116264372.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/2785352125.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/84160205310.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76547217595.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/zumezajemimovorudak.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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 19080 bytes
SHA-256: f55c0a4c1dfeb7c204c5606f6304fd448ce63f43494406fed491a8e0b0fb290d
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 10356 bytes
SHA-256: e9ba1ddb7ac936156489bf925253e4f3bed378bae55ebd251bcca10fa7447e9d
font_02_sfnt_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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