Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a841ace87584da…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 23:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b998b3ec28c5fb7c151b2850a15b02c6 SHA-1: bcae04b27438563c05d8c144205bfdbc2e666715 SHA-256: 94a841ace87584dace7e50d3ab516492748c2db2026e88f17784bb86aace99d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing activity. The embedded URLs and the PDF structure suggest a link farm designed to redirect users to potentially malicious content, likely to trick them into downloading an application or visiting a phishing site. No scripts were extracted, but the overall pattern points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://anipetkingdom.com/webroot/img/files/wororeratokuj.pdf In PDF document text
    • https://melz-feu.ru/upload/bemifapesu.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/34475778648.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/19745371200.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/89775366034.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/dokanigujemawapaz.pdfIn PDF document text
    • http://otczenacts.com/media/files/6726791764.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/wenoji.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/vapudijisodipukubajuj.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lekomozupifukamin.pdfIn PDF document text
    • https://majubesar.org/contents/files/rilaxob.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/gilimapifoteb.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210902122516_y2ugjh.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/nunagovedadovuwuvixavewu.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/1109649573.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/61205902731.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/xulilajolo.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/fujilevebitimuxoxerera.pdfIn PDF document text
    • https://riwg.in/userfiles/file/57998290809.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/pukufipelako.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/zejatisowebetagojubidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=picplaypost+app+downloadPDF 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 18052 bytes
SHA-256: ac493c8948fd3b28f510c1bbde2eb57f7d9c259969f0c4fe60d1ffcb51622225
font_02_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 10476 bytes
SHA-256: 9de19c8768ab268fd65f885bf78c794f218fa4a28a0da6c3bcc48a3987d05bbf

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