Malicious PDF — malware analysis report

Static analysis result for SHA-256 503d4ea5e798cafa…

MALICIOUS

PDF

94.2 KB Created: 2021-09-16 19:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad7d18f9236d0ea7f9b4c2f53c37bd91 SHA-1: ec40b28afff671aa83ee5e5241a7b22ab1d1371a SHA-256: 503d4ea5e798cafa268866d371ce237e01dfe6213871348b22df8df43352ac7b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically flagging a link to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous URLs suggests the PDF is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gkscam.com/userfiles/file/tekunadugojilolorezu.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/sedamizijelufon.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/paponerexobisovi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161304cfc4b74d---65970144074.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/19249369848.pdfIn PDF document text
    • https://salwangurugram.com/files/99362023049.pdfIn PDF document text
    • https://sharenkon.com/files/83299693824.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/68266490958.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/4922013115.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/nevenajutuvenisubap.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/zibozev.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/54338172171.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/bexufafixudakojarezima.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/20916051283.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/51033361092.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/betorovanipolimexu.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/24402337357.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4n6iq6a94g049u2knngv9gdhj5/27916203573.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/68089465335.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911134429.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/tipusavodutulanotize.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/rukekifurewivuwumudan.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/28760278950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=samurai+2+mod+apk+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 1888 bytes
SHA-256: 54d5e680047c0275be239c4ad274ad444bbe9aa94e270cc8adfe718f7e615c10
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 23756 bytes
SHA-256: 922d24dff0ef5b24855aade68499f9015a16ddf788f90a1621e9ba87a37e556d
font_04_sfnt_off000151b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B6 10628 bytes
SHA-256: a9ab4c04330d14b800f5460645e6cb4cef4a0613b40f1dcae660962159ae4c56

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