Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a576351a9415a6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 20:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4daecad6e40c81cd5ab823bc9ec9738 SHA-1: b9b8ac9b6dacf1480f83e83295bf2d8245b3498c SHA-256: a0a576351a9415a63f543cefa43afc829d9b7385725a62cf6c2ea0a2df6fef02
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://artikos.pl/userfiles/file/vekuzapolimegixakefi.pdf In PDF document text
    • http://telegid.tv/userfiles/file/dajofuludowerunap.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/jofagamixido.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/giwapesemezuvewoguw.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/65462329210.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lolozogutivasuku.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbf3e0788---72408619894.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/doforezawim.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/sujaninemebodofufubiled.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/21721833230.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/37051119253.pdfIn PDF document text
    • http://dentistturkey.com/image/files/tijesezagejol.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/335640180.pdfIn PDF document text
    • http://partnercable.com/files/71492042016.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/2831173863.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/zikopedidunafefo.pdfIn PDF document text
    • https://adikketiga.com/contents/files/91693873649.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/53209005924.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/fonukesagebupuloras.pdfIn PDF document text
    • http://renknh.com/ckupload/files/3019489128.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fikofixujuwodogopirezux.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138901603f87---87743156018.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/84975673224.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zibituti.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///21601828086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=looper+earning+app+apkPDF 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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 19384 bytes
SHA-256: 6c02a1a8e760b426521136dab031dc7e9b17f2f1af2ae4092c5a290d02f5008e
font_01_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 10164 bytes
SHA-256: 46452e2f8952c94883d5701aed7d6373d39436a5787511b4300702e0413fc955
font_02_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1