Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5c3106bb8930fb…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 21:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b26e6545612b7c5bd5888d1d3271575 SHA-1: fb6309869a7feaa51d6444a7fc65579662215ba4 SHA-256: ac5c3106bb8930fb8903f3eab38939b5900ca3e309bf8725fda811c03f464ec1
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. It functions as a link farm, directing users to various PDF files hosted on different domains, with one URL explicitly mentioning 'download tom talking mod apk', suggesting a lure for potentially unwanted or malicious software. Although no scripts were directly extracted, the PDF structure and the nature of the embedded links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ltes.tw-goods.com/UserFiles/files/91015543568.pdf In PDF document text
    • http://mobilni-kadernictvi.cz/files/file/79823987133.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e5p25qm9i04a37am48t8o69hla/ripagukudokamivo.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/84089119017.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/90859905704.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///femelazaw.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/lorivutekitezen.pdfIn PDF document text
    • http://petrduchek.com/files/nilizijamutotisafimonumo.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vusevosodadewatisiko.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/zawut.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/fodururibonidawigu.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/8589764851.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108312229266648.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090712510373499.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/58804603910.pdfIn PDF document text
    • http://bibikid.ru/upload/zexepudi.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/vawarifotamir.pdfIn PDF document text
    • https://langumeistras.lt/i/File/76040809475.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/36187260421.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/gubinowewetemut.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/36643161347.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/31252177428.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/kedig.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/99045494762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+tom+talking+mod+apkPDF 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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 14656 bytes
SHA-256: 1726bd122aa1f48ddf446510012d89cd7c6a540e434bae560d51fa54483c73a4
font_01_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 10512 bytes
SHA-256: 0db5de342f09edc2ccbedac0d9e7444441357d388e84e74c1323cd9a26179927