Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e0a60ecc08d275…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 22:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: afb5dfbcc549757cb326ec1ed4d30442 SHA-1: fb06a8b86b866179d85985d2eb7515600d95f0d8 SHA-256: 87e0a60ecc08d275ec6a2c6b8ab116054911c5535bb48f8c98b2c3dcf23d4dfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://faresaldabbous.com/uploads/file/5426910865.pdf In PDF document text
    • http://palenice.net/obrazky_clanky/file/vakazubutagok.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/64451096841.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/ribevu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395128892aa---mapisebog.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/18003169008.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/10290616690.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/kanakofomivupatogoz.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/wavunonuvadotaxobunuraxoz.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109041906525785.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/zukim.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/45557917516.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/48920694236.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/masam.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/7392981618.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vapot.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/59034222668.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/5443761814.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/farexe.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/63807237809.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130227c8dbb4---durufem.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/xotimenolavuxanopenosor.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/redejedubexafusubifet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=poder+ser+juan+tonelli+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_off0000c423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC423 18500 bytes
SHA-256: 00108d1785221ace2a8eac511347514e42f8da44c6fea5d9162633af38abe493
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10720 bytes
SHA-256: a9ad8e2c10907791f58838fdb678e8154d5f37fd5df1f400f60f44f72f801408
font_02_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1