Malicious PDF — malware analysis report

Static analysis result for SHA-256 807bfcdb45709d95…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 20:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 494d71e25818c9d784452515c59c12fe SHA-1: 1dba5dc4ac7b8fe00265748dcf6a92720f3e46fa SHA-256: 807bfcdb45709d95d2c78b5ca7ad5182d329fddb6a5f207668c7135206d3ea54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the PDF is designed to redirect users to various external sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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.
  • 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://alquimia.in/admin/fckeditor/editorfile/lalejovago.pdf In PDF document text
    • http://coeb.eu/userfiles/files/tekezoj.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109221749599858.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/vabufulomurisivepa.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/wudofamujeroto.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/bipagenetaka.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sofiverusimiw.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/ninubora.pdfIn PDF document text
    • http://vaynhe.com/upload/files/26885103289.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/dorog.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/33968413440.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/63452656444.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/sazitof.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fiziminutotu.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/62120455902.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/zogafegulubuludanofulomut.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/83116701235.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zabalem.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/71185873205.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/50116821316.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cf1d0fc9c---rediwanobufamizukudew.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/bebebusizidinavakibiliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=simple+chess+by+michael+stean+pdfPDF 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_off0000abcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABCC 10996 bytes
SHA-256: 2fa6d554878d86cb61eaa43b6fdd992d7a04d46cf84b07f78a98d7bc034cb9a4
font_01_sfnt_off0000c4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 14700 bytes
SHA-256: b16fd6eb34133b2753fa8fb3ad7c63a3e72cae610813e0190b4f7694098ec258

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