Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40e1922e2728b1c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 23:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6167438bcd719c1cee44ed8e5d95b30 SHA-1: 4b2d9b2a77c7611fb2b928e5398fbf97aec6dbf6 SHA-256: d40e1922e2728b1cd30c9710245c640e3e21be436ea0c91129c9c26808d19ac7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest a link farm designed to redirect users to potentially malicious sites. While no scripts were directly extracted, the PDF format itself can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://nessium.fr/userfiles/file/ruzozalujid.pdf In PDF document text
    • http://h-st.nl/bestanden/files/66073775092.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/vomarokakisijirulo.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/26483541718.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/7812770845.pdfIn PDF document text
    • http://emannsltd.com/userfiles/20794801098.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/tuvenirinox.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jitowadonimabelekafas.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/84205441939.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109160409474544.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/68465605243.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/14601734990.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/sovizinus.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/puwoxuren.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143f4c8e7cdc---fagetezuvuzoxuponol.pdfIn PDF document text
    • http://vo23.ru/upload/file/fatafivatabo.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/mosejujusivukalas.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/39726267471.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8be392810995d3fd085e75fded7d7c0d/dagabimomox.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/lakowedobasuvegopupad.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/tamoxakokixit.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/dewovo.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109160937372415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=emulator+among+usPDF 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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 17252 bytes
SHA-256: fffb3e1072d61913fe3cc61c7900955a06331a72f1e507002cbedac46c1b6dcd
font_01_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 10308 bytes
SHA-256: 4d1555bc234ba621f7cbc4d2677817b36ee3eb979bd68b63cd4a3659b36af992
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1