Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5f19a93d672cae…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 15:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a05b522baee2140f05b16f46de2e421f SHA-1: cc4cf493fb40b2d229b0110dee87514330b72a7e SHA-256: ac5f19a93d672cae58f04c90f9c57011a501e24d16b1da1e65774329db1bf96c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://jshtextile.com/UserFiles/file///mebivufizuxuzonu.pdf In PDF document text
    • http://cgl.lu/userfiles/files/laloboripixabal.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/87153721402.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132460c05db7---bigufefekarofobiwagiso.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/61593217505.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/gigivix.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/gozepafimelewojap.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/61714695628.pdfIn PDF document text
    • http://nanopena.cz/upload/file/roletipebetikar.pdfIn PDF document text
    • https://filetorme.com/upload/files/wamowuleforonalorasejur.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/29391089337.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/8718440988.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/vetitep.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/80872881939.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/zoseze.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/zavibupibisat.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tifopusuvonekasik.pdfIn PDF document text
    • https://invest.pl/userfiles/file/watepemajixuzutulimowumim.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/377870899.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/seluvafibogugurujulesu.pdfIn PDF document text
    • https://akconta.com/uploads/files/terixisarigivu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/pabemajofugeletotoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cartoon+analysis+english+example+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 18272 bytes
SHA-256: 0cd1888eafc6d9a127c96d68ebb8046c625442b8a6dce9cea3d0200d75f27c32
font_01_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 11192 bytes
SHA-256: d6e3c662833ee048cf5dd106e24be8f772cc9245f6255999944479cf7709306c
font_02_sfnt_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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