Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85daa9268eb9542…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 08:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bcbd37d8e68521787fe3ab639448178 SHA-1: bc6c7f77908d27e4995f2478589d60c40c018b1c SHA-256: b85daa9268eb9542d8c903bd4133d6800e8b80eacd321f64256a4060ed40f750
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. This suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://highgaincomposites.com/img/file/2021917125431.pdf In PDF document text
    • http://lex.tj/img/file/55761005804.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/duzitogakake.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/30448177379.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79078299874.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/gaxama.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jafabezafosufolaj.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/zogopuzopenazegumojamonat.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/zunixewijof.pdfIn PDF document text
    • https://jin-ji.com/upload/files/98202665180.pdfIn PDF document text
    • https://korankertas.com/contents/files/85934061112.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/48346074255.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/pisipajiwakawuwevolebe.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/zowolololewozizovob.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/83923851733.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/18597147709.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/1413328627.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/54539448542.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/kilujajiralebukal.pdfIn PDF document text
    • https://istanajp.net/contents/files/kemomeb.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/sifiv.pdfIn PDF document text
    • https://cartolmania.it/file/zufimagedenemelanataf.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/todirigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=doctor+strange+full+movie+123moviesPDF 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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 11188 bytes
SHA-256: 524dc326edced5b236935a567beb2e6676d0cd79bcdcdb4c94958ebe851d2a40
font_02_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 19212 bytes
SHA-256: a09cda9ffd46cc3b631d8bfecb06be72fd11076519bdaab7dd03a025bb89f926

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