Malicious PDF — malware analysis report

Static analysis result for SHA-256 e517bfde62259312…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 00:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b725755cf1f95cbaa3a3fb4bff5120bb SHA-1: 1830eccf874468ebb67f544cfe20a548782eccca SHA-256: e517bfde62259312f11cd0d4e07d7aa0f7391aaa2ca3de1c561ca7766c750c60
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and an action trigger. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's intended to trick users into navigating to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://orrizon.ru/images/file/28022806284.pdf
    • http://greenearthgardens.org/userfiles/8805515870.pdf
    • http://ziconiavip.com/uploadfck/file/26168587179.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/15883507420.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/25394700838.pdf
    • http://tvsatkrosno.pl/userfiles/file/10113139413.pdf
    • http://kengosushionlineorder.com/uploads/files/35335555845.pdf
    • https://pragatitic.org/ckfinder/userfiles/files/pogiruwuze.pdf
    • http://www.europesolidaire.eu/userfiles/files/78419710062.pdf
    • http://membranekeyboard.pl/_data/file/walemesevogefumimadulute.pdf
    • https://pyccenter.com/images/Upload/file/88536144115.pdf
    • https://taipeitccia.org/CKEdit/upload/files/pirofetatinevelu.pdf
    • http://morecoredesign.com/images/imageUps/files/80246503918.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/lisixupulerom.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/16673853118.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/nazozarado.pdf
    • http://residenzaeden-albisola.com/userfiles/files/36499194770.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/kamuvaw.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139d53c4f690---71711638173.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc225f21a---60389257929.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/61306749340.pdf
    • https://santaclara.com/wysiwygfiles/file/19128641782.pdf
    • https://cargobull.cz/res/file/miker.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=play+store+apk+for+mi+tv
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ad.bin
fba30128479aa86e60f55acb33affdd964c254d32bab9d591f42b2e0da453fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AD 10688 bytes
font_01_sfnt_off0000c952.bin
42abd525faa03c28ec8d47099c1e28d265308282592233e66f8ae0cc2e7014e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 14276 bytes
font_02_sfnt_off0000ec62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 16792 bytes

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