Malicious PDF — malware analysis report

Static analysis result for SHA-256 544aca29a88b1c06…

MALICIOUS

PDF

76.5 KB Created: 2021-09-30 11:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6a51146bd663e5cbdc2fb81f189d3099 SHA-1: ce9d1931ae2b55ed12659b9b990f106d31eabf8c SHA-256: 544aca29a88b1c06aa5f259c2b7c3ec7cbf0e0554f828328124021a4cbdee30f
146 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains, and is described as a link farm. The heuristic 'SE_QR_LURE' suggests the document attempts to trick users into scanning a QR code, likely leading them to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fruitssupplier.com/app/webroot/img/files/17457101070.pdf In PDF document text
    • http://ellissi.org/userfiles/files/fadavanodurojirogenuwetev.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/laliburod.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/95527775073.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/zabufurewonugapanevofuru.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16151cd646362b---tufawopekupipalapidir.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/xiwafikawijixugesubijole.pdfIn PDF document text
    • https://pellevah.com/upload/files/75842949473.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/luzeka.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/jedalogawudavasidetol.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/lubipoda.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/jonemizosawu.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/gelogomuxu.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/rajebibafefadiveku.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/81914187293.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/lomudekebexuxisub.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/61326587522.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/lebajaxogixagiderid.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/nokiduvipato.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/81676224613.pdfIn PDF document text
    • http://leruichem.com/upload/files/gowimidapopovibe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420020711da---58257045871.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/49482827342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+can+i+scan+a+code+with+my+iphonePDF 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_off0000c147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10824 bytes
SHA-256: b3415a1748fd93b28ec5a8a0e6ae81e2308ac69bb2e6a4b31ab76efbc30e0cef
font_02_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 19032 bytes
SHA-256: 96492b1ed07376cb31697819afcd193a2e6b27889cf5745ceacbd4d86acfa058