Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff68f218fa99832d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 14:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e628d826d3d63f787fbbc340b6c5afad SHA-1: 55e6711505f3b4626de54feaef55b9656dd4c9ed SHA-256: ff68f218fa99832d34af33dcf7544b991324137c2845850167a257a517c99ff6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and embedded URLs point to malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=como+configurar+apn+no+android PDF link annotation
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/14400401751.pdfIn PDF document text
    • http://webs123.com/userfiles/file/90169983571.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/22861392387.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac55eb5b2---zikavubivuvo.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/93264962597.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51632671884.pdfIn PDF document text
    • https://emenu.hu/editor_up/zumodomuxinugi.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/41671813531.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/94085770086.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/96863220386.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/14106072101.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/zodomowikew.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/51996730225.pdfIn PDF document text
    • http://iscelenie.info/files/file/72264921402.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/44973427531.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/wuxekiwobateluzosopa.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/45461496028.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/42147378484.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/19505564282.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/fepesabo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffee48e357---18829489830.pdfIn PDF document text
    • http://netart.hu/userfiles/file/gadef.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/goselugodinubemapitemenef.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_off0000c495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 10648 bytes
SHA-256: a6f692cf4e65981bcea6ccc092fce63cecfbc37da04bce25404e52b97977d977
font_02_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 18996 bytes
SHA-256: f6335232e1a4ee47bac290ac040e189bdb79870f7e4f127600248f237e33c5c4

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