Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ee8d72ca5ee9ba…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 06:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ef0fd451fa0d70defe2f670952cb482 SHA-1: aa825127dc7ba9db06e625296f13ae9895686191 SHA-256: 91ee8d72ca5ee9ba4fa5993291c3cdd0d854c2b8fe590ae711072a72b1d1cb36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a spearphishing attachment, designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=best+auto+call+recorder+hidden+app+for+android PDF link annotation
    • http://studiochiodo.eu/userfiles/files/53692591746.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/kasefetuxunez.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/jerifelibotevakeruxejuxa.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/76804148688.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/80756648669.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/xakerozozonizofizupodaxur.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/artcano0jrvik33ai63gdmdfnq/tateroxedusudujanetew.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/tilufulagewalokelarigake.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bcdbb5177b937c9a557eef5476fe9417/6426187833.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/dakibiw.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/50188282106.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/luxilamadusi.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/12863036505.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotuvu.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/foboberarixufofixolopovo.pdfIn PDF document text
    • http://agavietnam.com/img/files/filenozaxenoxurabasumute.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/widularikadudas.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109061512196771.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/bitugutaj.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/32781728252.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/kisilazo.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/fubakelikotesisi.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/42116743849.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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 20412 bytes
SHA-256: 4e0c293aa506d5fdd9fe14a5348e582f066b9454b79fea45b71ba55b74a017f7
font_02_sfnt_off00012b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 10872 bytes
SHA-256: f96fae9304e204cf14418ab7d515351f39bc1cc723396e1816fb297423666c96