Malicious PDF — malware analysis report

Static analysis result for SHA-256 85901c3f2119c3d0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 14:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c20539168eba69653b11b9834209938 SHA-1: 83decc3f083920c1500d6284c24e024b2677f342 SHA-256: 85901c3f2119c3d012927e09d9201c6115b4e18d3b633ad6b5e6a20d2668e315
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bachtungcompany.com/upload/files/62872006878.pdf In PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/69964576928.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/wazefozapekazagixisej.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/jowunabelafefumud.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/umn1usrhp755nlum4k0o3tj1h0/patejefefilabugesewabezi.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/xulakibaraligosudujokefox.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/xagotewatofatuze.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/nanarivoroj.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/ruwenupob.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/89952971789.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4abb9a60---38528854934.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/2083279898.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1687758758614384fde7810.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/vozobonugi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/89474591089.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/65868141938.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/29878006679.pdfIn PDF document text
    • http://arsvet.ru/img/upload/72582075652.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/ratebu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/neduwejepupitalevalaresek.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/mivilukaxivanu.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/94857630725.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/34470860538.pdfIn PDF document text
    • https://ahha.az/userfiles/file/53338234370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+use+redmi+note+9PDF link annotation
    • 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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 10544 bytes
SHA-256: 5ba5e61abe74b30e5fc0f0ee473bcb7d8d781346d1116048263fee2070e55ce7
font_01_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 17452 bytes
SHA-256: b2a90922fb96e624dd5b490af47482833b0e6b1f44c2ff8eef0c8b0487381f32
font_02_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1