Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2890c202c8aec…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 00:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c5e2e0873d13f21420013627f478c011 SHA-1: 8ff195900af9e4bf5fc4fbcb38e3f7090f58089e SHA-256: a4c2890c202c8aeccb3154357d7e1a8f74514808b373dd06d99c7a9373757770
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains and are structured to appear as file downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM firing confirms the presence of a link farm on disposable hosting, a common tactic for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://sofahatinh.com/upload/files/12734919451.pdf In PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/80069672876.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/kunazegeri.pdfIn PDF document text
    • http://evola.it/userfiles/files/60959689516.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/valelukolaterelozudexavi.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/vitowemutuw.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/gemodetolape.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/suton.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d29c7edf2f24ed0d8782578c96c782b6/fofetejebodosereliwerel.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/rebawus.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/xedixamuzipubeso.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/fovixavogesi.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/57804955615.pdfIn PDF document text
    • http://szm.hu/userfiles/file/welajivevomajenim.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130056fc7a02---lojosuv.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/46001006129.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/kupuvusimaludagujevakiz.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nixabewezamozu.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/8942823169.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/26843246320.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/sutekolebezotap.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/kagamubik.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/nibikiguromipogazagavuto.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/fidemixikumevib.pdfIn PDF document text
    • http://osayit.com/images/file/81360969934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tubemate+free+download+latest+versionPDF 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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 10868 bytes
SHA-256: bf94c0077f3306c23c08bc9d7819fe2be416aad0cd87797dc00879453b519e80
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 17436 bytes
SHA-256: abb76e0da9b334dd7ca8f3a3cb1706cae20b66ff2da6a685426ea38be0f36b81
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1