Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587e4493cb11c58…

MALICIOUS

PDF

90.2 KB Created: 2021-10-05 15:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 67898348823a6eb06a0a758e82514277 SHA-1: 6f35d3a89eb474cacb87425cb1246634986db892 SHA-256: b587e4493cb11c587328530acef615846687b62d3b31d842d275df24bc5ab075
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or credential harvesting, disguised as a 'lost iPhone' guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=i+lost+my+iphone+how+do+i+lock+it PDF link annotation
    • http://robwalker.net/fckupload/file/72770888473.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/nepof.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/misikamu.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/78168927878.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/feterevirufetikuwuxelizid.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cee714a4cb5c783bcb82b10949c7af98/midajojevawo.pdfIn PDF document text
    • http://thegioioto.store/upload/files/18501299439.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/gedalutefosovologul.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/vupudez.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/10906737902.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/xafezubawur.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/bebevisivofawigafug.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wurutodezidunevevi.pdfIn PDF document text
    • https://spacio.hk/attachment/file/lejirafotijidokar.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/9443639272.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/xeten.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/womojufeg.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/17596456482.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-26/20210926145907134397.pdfIn PDF document text
    • https://nexapos.com/upload/files/39873267540.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/70155196682.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1ebdfc3fc0f33904d87dd9be07cebacf/zageriritozenirobum.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/nuwotipujevekowekirasoj.pdfIn PDF document text
    • https://schmitz.cz/res/file/lekolajateto.pdfIn PDF document text
    • 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_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 10760 bytes
SHA-256: 31a71b5dbb5ef65bd2aa1dfb6eef029e36ccee02c219d55986606cf59ec527cb
font_01_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 19712 bytes
SHA-256: 4642d3b42fd1ce831075f5991a34749a1710d7324a3f47508176af3fbf84b779
font_02_sfnt_off000142f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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