Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aee0592b73c5a3…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 19:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4967a0ddf0d100b8b0c999d7d962161c SHA-1: 31f910616d234b861d5259374c326964722284ce SHA-256: a7aee0592b73c5a3221bbb020cc5f408c65eb25fa6428c63302475725db2f149
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of such domains to obscure the true malicious destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smidgel.ru/uplcv?utm_term=thermotron+8800+manual+pdf PDF link annotation
    • http://abw10thstreetne.com/uploads/files/58858374112.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/mageladen.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sugatopavedokipuvevo.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/38073177389.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5752bbc164a85349b069010c14d726eb/95653141567.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_ACFEB5AC49FB011E.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/44375028927.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/29929837687.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/valelulepafemi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xesuwigumudanixuba.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sumujok.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57673339061.pdfIn PDF document text
    • http://pololanna.com/user_img/files/jomugimimuva.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210902234800.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/65253016880.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/zetijojadujupevuso.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/28607669806.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/deguxivasarisukosube.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/karakexuxonagizuseku.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19d654b67---kamafadisafokaxatesim.pdfIn PDF document text
    • https://digireg.dk/upload/39321758838.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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10896 bytes
SHA-256: bd1398db19c4383b8ed871a32d614f99198cfb19532a91f4d3261fc80a6e0c4c
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 17580 bytes
SHA-256: cf8cd2d0d0be555ce4eaf3d9bed5de4097cbd602ede0d7f638ac257b94fd93e5
font_02_sfnt_off00013d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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