Malicious PDF — malware analysis report

Static analysis result for SHA-256 1867181a0847f614…

MALICIOUS

PDF

78.4 KB Created: 2021-09-24 05:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71c8e8a391bc3553ad9d388602501836 SHA-1: 188982e0e976df68d35a6da705376593f1f2686e SHA-256: 1867181a0847f614a7458995cfb7d60eda540bb8ea39169b0f02b83fd940170f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=kali+linux+operating+system+download+for+android PDF link annotation
    • http://thevisionkharj.com/userfiles/files/fupulujozib.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cbeaec174f7f3555b59434d9cb989f15/2355112695.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/95605124576.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/bumufesiri.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/7761651301.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/xirepomadugofesepazawur.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/3446620739.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/terewufapipuxow.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/71724998053.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144c109405be---85136789263.pdfIn PDF document text
    • http://telecycling.info/files/file/mipedamiwibakizaji.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/47563727436.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/48922692694.pdfIn PDF document text
    • https://tadimtursu.com/image/files/voluvokewitozuso.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/wajidezesupidabokazaduve.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/busotit.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/wuxed.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/ziwigapoga.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/54494954326.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/fudemevezume.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/79710873585.pdfIn PDF document text
    • http://saktigroup.in/uploads/25338598681.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_off0000c4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B6 11232 bytes
SHA-256: 77de377c65d39fcfd64f029ff960db85ca8799ea46f818dd8290c9ac5599e981
font_01_sfnt_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 20260 bytes
SHA-256: ccfaa9a3dda6995b36301ff64239802831b961b1b4965873d4802ee171fe8879