Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d5086f9c9eda11…

MALICIOUS

PDF

68.8 KB Created: 2021-09-13 08:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 78d83da66281d615e840160180a8a50b SHA-1: 268c52fad9ba447af2d6ef81bb6ac17816bf6539 SHA-256: 04d5086f9c9eda1196784eb67398b567dfb46c009739e437656048eef0a0657d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure due to its image-heavy nature and embedded action triggers. Multiple heuristics indicate it functions as a link farm, directing users to various external PDF files hosted on potentially disposable domains. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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://ntpuvoice.com/ckfinder/userfiles/files/93203146926.pdf In PDF document text
    • https://meganimal.pt/site/upload/file/sudatotodif.pdfIn PDF document text
    • http://mobiliteit.nu/files/31776460194.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/54016165020.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/98442336790.pdfIn PDF document text
    • http://zenithmetals.com/files/63466510694.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/32366314830.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/78696466392.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/balevuzojetepepofeg.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/39934050084.pdfIn PDF document text
    • https://vientangluc.com/upload/files/97144363355.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/reremajepopaxew.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/76137611001.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/ferojivolipiterape.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/97458189696.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/jutagelafixoza.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/84812768771.pdfIn PDF document text
    • http://beiks.info/public/file/39636253331.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210909_C686D1FDD4495B40.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/guwag.pdfIn PDF document text
    • http://rjt1.org/upload/files/89621269785.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/17113947664.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/panukolefubuxigulugiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dr+prakash+baba+amte+the+real+hero+full+movie+free+downloadPDF 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_off0000ad23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD23 11248 bytes
SHA-256: 616170b69f8e1468abf5ea8efc952a5ad3f55e4c8ad5a14de8910c4632ce5324
font_01_sfnt_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 14300 bytes
SHA-256: b7189a57ea10d7702f7b652c0ba025499d36a827077e19bd4af483f74439aebe
font_02_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1