Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e2d87aaff94b68…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 07:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f8ca2fe44e9932a1e3b67b0b163ee96 SHA-1: 7ff806be5087469071241d0aa157bc117a8d361c SHA-256: 90e2d87aaff94b682c25301ab6bd1f396b3baa53a5be57f5508e9af6a46e3608
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://krisoc.ru/uplcv?utm_term=a+thousand+splendid+suns+malayalam+pdf PDF link annotation
    • http://baoveantam.org/upload/files/tobutik.pdfIn PDF document text
    • http://imbirimbir.ru/files/gidopepitepur.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/gebimo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/vivazirafilenigipowuruxo.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/tabasisavejika.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/rovesutisaguxivesesabenox.pdfIn PDF document text
    • http://wohingltd.com/userfiles/soxijasoliva.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/96805689509.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/6467177651.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/dba7162989dd461dc34c1afc367eb4f5/tapugidamefovuvakazup.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/mubugala.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/78954082457.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210913_5FB1C76B3857B01A.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/merofepakakenelobezalano.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/donavebikunexonunijiw.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c90bbe1648---raveromobazete.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210915162456.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/77103354238.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/53743803923.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/turarujoloraxavowiketo.pdfIn PDF document text
    • http://normel.org/files/upload/file/tebuloxe.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/milotavelojexexu.pdfIn PDF document text
    • http://househouse.it/userfiles/files/vepigogodu.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_off0000b1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BB 16728 bytes
SHA-256: c94a6f333cc098fea24f2bba717e16096a06c03fd4f3e762b12586fbd253bc79
font_02_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10860 bytes
SHA-256: b159df1c2f976c6bb72a760d5ca94e4c8a01c4b3be8226e3bab824313ea02189

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