Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6aad15a8c217184…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 01:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72cc6ea25d8f9cddcc9d9bd3b914668c SHA-1: f74e2d4b1d32a8b8955998c9c7794060cb645c61 SHA-256: e6aad15a8c21718406a1808615f0f0db5769bcd8ff3f2deb4a9e11cda50c8c1c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, containing numerous external links hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing attack.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=dissidia+012+prologus PDF link annotation
    • http://net-marketing.hu/images/files/xumukofagokiboge.pdfIn PDF document text
    • https://ms1oke.com/contents/files/wunopapabedazudoxo.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/giweduju.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0912/4ea05c6d4c8d6f6e829c8f88f4e59cef.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/norepamalov.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092606152868.pdfIn PDF document text
    • http://www.agot.pl/upload/file/82704410071.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d41901bd9f56db49280ecb2c9aea22cc/bipajumekokadaxosapiz.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nefimelosuf.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/49692357141.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210908065355.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/80323581356.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/52381369966.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/273f1ad2b9698b8ec22b44767df5baf9/26046677697.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/jogefidaforeruzadu.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/parividurevugimovidunibe.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/kotikexuludurirebilez.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/lugekaman.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/42965566900.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/legexezusixad.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/50958028034.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/fekusosujosirefeb.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/xuvuropekavowig.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_off0000adbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBD 14092 bytes
SHA-256: 84bee8d401abf1e24a1d474ff55a84ce8237aad1e9182e5c7bedc0f6881d66f7
font_01_sfnt_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 10628 bytes
SHA-256: 37833e4f15673d8e8ef4e8416b1a01fbbdb91030b7a6d4408d6da84ac9e2b1a3