Malicious PDF — malware analysis report

Static analysis result for SHA-256 b604a88db3765cf6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 12:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3ae7d870e521d6654750b6449f29638 SHA-1: d39f0730d386b6ba9e56034f779c25e5e6cb02e0 SHA-256: b604a88db3765cf645de62ec8be85b63d0a34cf15704be0c532ed9196f611ca8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of many external URIs suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/79989959839.pdf In PDF document text
    • http://jgbt.us/pds/userfiles/files/kodotalemanovesefafeluk.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/winubajebesusasutavekaz.pdfIn PDF document text
    • https://il-gusto.com/images/file/jipikokupoxe.pdfIn PDF document text
    • https://matratva.in/userfiles/file/pupiredijuditazilevikid.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/78187665235.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/9498868576.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/52485705925.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/wevis.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/32553244323.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/29817089338.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/67566044916.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xusawu.pdfIn PDF document text
    • http://popeyebio.com/upload/files/50612030875.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/51927431361.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151971b45f59---tarideri.pdfIn PDF document text
    • https://olterus.net/contents/files/sajorozexajakakisilow.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/45754222291.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/31648738287.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/3048250456.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/42555213820.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/84221900262.pdfIn PDF document text
    • http://boldogelet.hu/media/26292964579.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/xugewozevenetezerig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tinyzone+tv+appPDF 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_off0000b2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 10132 bytes
SHA-256: adc25656133337bf5d8655263a21d745cf8f2f2a3dd76e38fcae7ae337a14bdc
font_01_sfnt_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 16916 bytes
SHA-256: 4e9380e488fd5df5ca01ffc37f408cea703e87cbe09c43bdb5e4393bbe2c5cd5
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1