Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf8fa4ad9356315…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 17:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2c10562d96651ad9ee0232cede1d88b SHA-1: da22918306ab2ab171935fdb99577b5717662366 SHA-256: 7bf8fa4ad93563159038e1e7a477dc38ad1bed714cc59f1ddb607cbe672da4dd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various unknown URLs. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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://chorland-dining.com/webroot/editor-uploads/files/82854546483.pdf In PDF document text
    • http://4grd.com/cmsimages/file/68275162105.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/50838495714.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/46165415142.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/19852331617.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/fuvaxopifasudegasof.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/newemidet.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/62686988518.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/falufa.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/fejulevevepuxikip.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/gukow.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/90491094239.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090714581667.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/depedusigok.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/34369509227.pdfIn PDF document text
    • https://computerzone.pk/file/23393969462.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/kakedo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae306e2c1---73182928830.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/jerexuxotuko.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/66065988386.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/dodumizubomabodopobur.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/vuloloburuvosudizimu.pdfIn PDF document text
    • http://c-six.it/userfiles/files/xemazebulogijajerewog.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/kuxirosotigobosud.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/33485951202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=solution+of+abstract+algebra+by+dummit+foote+pdfPDF 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_off0000aeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEB 13740 bytes
SHA-256: e1127507c2a71612a8d882a4116993003c2df754b8a712c6d0614d3bf583ab47
font_01_sfnt_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 11392 bytes
SHA-256: 69d1a1552764555e39098269850a1b784f64f39389f2018e99d99a4329cafa85
font_02_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1