Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca7e767e95aad47…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 17:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d5303fcf86978f90d0dd6279b46c540a SHA-1: 92e103fe60353a26352b2a4da2214c41956d75ad SHA-256: aca7e767e95aad47fe6e5a547ad65ee933e1a98f385932baa335353d9fe54e0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure points to a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://wmasgroup.com/userfiles/file/gidewozurunufotid.pdf In PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/35771273861.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/73456177786.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/45279221823.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/31815079879.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kaxizogixibiz.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/38100873947.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477d7fe01c2---35490686865.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/dodakududizodorito.pdfIn PDF document text
    • http://snsi.jp/image/news_file/2493595504.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/sasuxu.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/34566122018.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/lifomega.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/51049365347.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/xevedunevepekefabed.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/sobonelofunevugameweteja.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/bifixaribapuse.pdfIn PDF document text
    • http://consade.com/userfiles/file/jikubutavogalurizajama.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/39186632789.pdfIn PDF document text
    • http://gskrem.ru/img/file/vomozuvu.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/vuvetasazejuxefob.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/16913420449.pdfIn PDF document text
    • http://93564497.com/userfiles/bupijevikivixufegifin.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bonogepilunifasopi.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/mixewomukilusonuk.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b98e7eca7c---23496730881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=developer+options+pixel+4aPDF 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_off0000b4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A5 10492 bytes
SHA-256: f767289fca7dcd046c39e16d6a6631648f404473c3dd76a5f98f21ba6aa4826f
font_01_sfnt_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 14308 bytes
SHA-256: 7ad0b7cd468f3d36cdfbd0253858418b424baa2086d704d6d0fdca08aaf2156a