Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb7c5acea6743b9…

MALICIOUS

PDF

88.0 KB Created: 2021-09-22 22:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06cecb21328dafcc404a8f2730a6794c SHA-1: 7e858c3e744e6781f3c88e0ff2432d82a7f8bc88 SHA-256: afb7c5acea6743b90c4e6c3383fcd440e5277b3727e4444393d960a204554400
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for link farms and phishing lures. The ML classifier strongly indicates maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were directly extracted, the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://huntic.ru/uplcv?utm_term=cricket+tv+apk PDF link annotation
    • http://kmjmt.com/news/upload/file/210917055110310717t28oyr.pdfIn PDF document text
    • http://llux.vn/uploads/files/dotokebalifuveni.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/mujunopakoje.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1061656936146b2adb438f.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/67941694230.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/5195838733.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/kasajevukadonituneg.pdfIn PDF document text
    • http://leeandrewdavison.com/download/vawoni.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/77811689675.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140edf658728---tuxipazogugikogagimum.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911101943_0d5bai.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/regedoxulotudutofevij.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/33501931677.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/92862855337.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/jelowa.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091004140466.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sawulet.pdfIn PDF document text
    • http://zubrcup.by/files/files/30305096215.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/gobilubifetumit.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kurejixezepuzebovebuzupon.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/tupudog.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64652614311.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/45223084091.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/gojit.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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 10120 bytes
SHA-256: 6760bf3f8619401e59cb8483bd123db1f1bceab080f5d74fd8791f6f7d1f7c28
font_01_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 17752 bytes
SHA-256: 5133389e4767757716a4866e315f03f7e07bc03d56d2f6cea0816f065e03b5f6

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