Malicious PDF — malware analysis report

Static analysis result for SHA-256 8397f6e756efc602…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 01:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f5fba9c65cdc5d315dc521f9f7c1638 SHA-1: a222ccf4e65392f2ac366b8990889cde00b22904 SHA-256: 8397f6e756efc602c3d36f7e7036826d2fe8e628d65ac6fa6f23c50763b5bb89
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 as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to external PDF files on potentially disposable domains. While no scripts were directly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://marklaliberte.com/fckupload/file/makesuwoto.pdf In PDF document text
    • http://startent.ru/SITE/files/editor/file/51624699938.pdfIn PDF document text
    • http://checopharma.com/upload/files/kagutikebinoguvorepisewi.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/67566724800.pdfIn PDF document text
    • https://intersat.lv/files/file/vovaganoxu.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/59021802886.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909105324145597.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/zasefaluk.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/67206061437.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/3439151533.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/mukazuxibudanovinek.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/wapixifegegifone.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/gijelawopadubafasu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/nazobonaxinenuzefemajenoz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d378833b---wawulokodibija.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/tetaripupixedo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6e369bbf---jigof.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kifujolopub.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/pulonosibudivujutaja.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/59401168562.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/badikujajevenure.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/5256746142.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/guwusirexejudefilijomiva.pdfIn PDF document text
    • http://nscenter.cn/upload/files/gewozazorir.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/waxor.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_21F3932A3A8D257A.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+get+to+the+widgets+on+my+phonePDF 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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 10724 bytes
SHA-256: 67893810f4fd6974f87e69107053c762124075aa658d0bd74cfac9c4dc5f8229
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 16388 bytes
SHA-256: d4601cf5cb450a0c41748fea3aea1cd7ed8e53f61be9eac86401bb54fab04cff
font_02_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1