Malicious PDF — malware analysis report

Static analysis result for SHA-256 84339187c8897976…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 01:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1817bb395695560b9804dfad19446f09 SHA-1: e68055ba97c9ddff496383c92ba15b79164e831a SHA-256: 84339187c88979763dbc147d2024f1aa2e459a80652c70a4303e33863b207e54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous external URIs, likely to facilitate phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

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 https://smidgel.ru/uplcv?utm_term=gandi+baat+season+5+watch+free PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b093eca3e773bfc75f67de5d614e6128/80453064231.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/93703337331.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_053218.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/46724886879.pdfIn PDF document text
    • https://agros.net/uploads/file/98569721534.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/mujudiwijodilowubaf.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f300ccae81---befubegewadinatizolapux.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/botopomininobirix.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/xazesofa.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/sitafiregevatajezetava.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///nepiwipo.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/monodutukewiwo.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/narukimuji.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/xidezufikagozolutusim.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109100406558651.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/febojovizaxifanesatesemut.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/gotiramupatazuzituxuxezeg.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/75863793779.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/82770813059.pdfIn PDF document text
    • http://dakov.hu/_user/file/pipuliridi.pdfIn PDF document text
    • http://emannsltd.com/userfiles/dadeg.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/kiganemuf.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/29245817142.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_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10928 bytes
SHA-256: 904d7978bede08fd87a58931db7743fe29878b6347682678c7caf2e4e29aa0cb
font_02_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 19128 bytes
SHA-256: 292ea9b4c368706a0bfa355fa8ab9e8b3830b11ab7b362c62fa3c9f8cb38ffa5