Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89d1dac0b7a4610…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 07:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de582f63a4c6a44297e6a4fc03d94e11 SHA-1: 619ee76351f0818bc8c6d0b71698cdcb4c915410 SHA-256: c89d1dac0b7a46103a39bbd9374c1cdce4b6b1ac714f436f8198215e039cc45c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=samsung+galaxy+tab+s2+latest+android+version PDF link annotation
    • https://wecareprogram.org/images/file/41671963432.pdfIn PDF document text
    • https://ms2oke.com/contents/files/noduvologomapaxatoma.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/foposepotesopaz.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/75371612728.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/59278564373.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/90653546033.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/lebog.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/8462214647.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/90856796424.pdfIn PDF document text
    • http://haai.org/upload/file/15222162150.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/xazuxafipirobup.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/47456076887.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/39977252677.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/kusimijaponuf.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/rozidum.pdfIn PDF document text
    • http://home-plast.ru/foto/files/wobozejevebusi.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/18591696553.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/41975294097.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/25071231188.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd016e4e39---wisadozoxoj.pdfIn PDF document text
    • https://viceda.com/userfiles/file/22479782862.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/tovogofelanuxewotufek.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141df5c07691---lanodefefu.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/75544008476.pdfIn PDF document text
    • http://eventechsite.com/files/files/62277736433.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_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 11308 bytes
SHA-256: 045dd05914e530e84aa5466c4ddffe189bd0cb9567eb36433e4a9bdf92040a89
font_01_sfnt_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 17896 bytes
SHA-256: 1eef69e8eb86237bb7fa315b18e25721782b03819636f733fdaff637ede57179
font_02_sfnt_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1