Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a028102c4e326e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 03:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9afa37518cb3772853da075bbd51f33c SHA-1: ee2e00b67eafc7a147f5767836cc2bd8500c0ee6 SHA-256: 99a028102c4e326ec144bf694402969bf2ae8f01fcc328225df1a04342a31ac6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains, and impersonates cloud document services to lure users. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://catamma.ru/uplcv?utm_term=whats+up+google PDF link annotation
    • http://centralgiving.com/media/userfiles/file/85163432212.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/31435172416.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/76162102556.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/kevovabo.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/73684107894.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/79292116610.pdfIn PDF document text
    • http://health-bridge.in/upload/file/36234980738.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/9427366136.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-09-20-58-27-39.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/nudukidina.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/77053253546.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/8247593016.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/xenosobe.pdfIn PDF document text
    • https://epiphanych.com/images/file/75498059700.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/95863145203.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/61977822003.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/vevelodibiru.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/12623701074.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/nukatixozed.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330cbdb9332---79982663854.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/misinitujofozolamolame.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/batavinufugigo.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/kamovagilo.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_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 23484 bytes
SHA-256: 0a4d6051b3521b8c4d770ea4335e573acf4d06c41573f603189661b85cfe5278
font_01_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 10328 bytes
SHA-256: 9c554c1b765334f6989aff1cbb02c084381653b693be72b599a591a5f27cb9d5
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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