Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d26be7f0f2ca41…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 00:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa236852ca759f0cf868218d4a4c82ee SHA-1: 664ae6aa177a8e562f18542a1de62d439e789763 SHA-256: 45d26be7f0f2ca4180f3e195d85c7e28ed0b5309165c355103f10827ab89d9d5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3349

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 http://lonerangerfanclub.com/ckfinder/userfiles/files/99025974169.pdf In PDF document text
    • http://vetcasatenovo.it/userfiles/files/80978738260.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/nejivopu.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/29634961513.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/rizofoxewotelikepikorut.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/sotekagagifevosolutudoj.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe25c9711---javuwogi.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/75000841379.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/vokewakutuxixevo.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/tolizoj.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/kixivimukafutiriru.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ec795aa98c73f02edbc68d9f284c5b7d/polirowevizamisogeli.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/90487007112.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/43078150757.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/48771522672.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/62992506771.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/wagokuwejobimosataxepa.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/93053530068.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-22/20210922141214812274.pdfIn PDF document text
    • http://pb-book.com/user_file/file/naxabakiresawepuk.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/gifatip.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/36547373168.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/favivo.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/17392165322.pdfIn PDF document text
    • https://salwangurugram.com/files/16321786289.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lonitojinabojatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+turn+video+into+gif+androidPDF link annotation
    • 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_off0000b25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25D 17220 bytes
SHA-256: e8c133f67b2c920e174865c9df6803ececa1888bab88e9c9ef903980d5a16a06
font_01_sfnt_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 10560 bytes
SHA-256: 0bd4b6fe5d0b303be724b9b9f3829e78b3f31cb4b538a0ed3aed3c5b17230eb8