Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6f03bf87e1eae7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 22:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 38b9f7c256599660443f340c198ffe0b SHA-1: 4afdd6280d0c8729b3d1c7784cf22ba825c43666 SHA-256: ac6f03bf87e1eae73ce7ef382b64e2bfe6794f0fc953ef9303d8826ab10bf1d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download' button lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=download+gta+the+ballad+of+gay+tony+for+android PDF link annotation
    • https://lanhcongnghiepthinhphat.com/upload/files/487770577.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/kulodanelowikan.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/dafekaje.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/61800326147.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/meboze.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/sokuwepet.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/nexarusulozewem.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/21361381206.pdfIn PDF document text
    • http://wohingltd.com/userfiles/xulavup.pdfIn PDF document text
    • http://househouse.it/userfiles/files/vimaveluwosilitemonowodim.pdfIn PDF document text
    • http://dakov.hu/_user/file/sevapevuzas.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/50219055737.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65600101205.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/muvujoleromo.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/kufelologaduvi.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/wemebub.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfc73de78---senuzilezavikuvokufaxot.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/49260471688.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/11954488407.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109081522374497.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/zurabitatomiki.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/tetepil.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/92824958864.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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 10808 bytes
SHA-256: 837db49fd0a5c5461be54c062d3695d0125279fce52cbbb2a5045bccd7c7be73
font_02_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 19308 bytes
SHA-256: f725af6fadcb9e74ac74ca7e009b06d5b0d5c3ab2e6ecbfe2a5484131101783a

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