Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5342bbcfa4d2f1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 21:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4636ab1b04b7af0eac8f9f5dac9e9526 SHA-1: 4d008ac26d858dcd7d90e4f4991808ade39d73e1 SHA-256: 3d5342bbcfa4d2f1d586c050caf994c1ac530adac71179d489095937dd14b280
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a lure to external phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://wastran.ru/uplcv?utm_term=bcd+to+hex+conversion+in+8086 PDF link annotation
    • https://underworldgear.com/admin/images/fckImg/file/dubotofemivodejuvujewowev.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/56244559444.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210907200144331589g7kx7.pdfIn PDF document text
    • http://lactopad.com/uploads/files/53651118076.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/38494497399.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422f33d423a---temogonowamusovinipoxowi.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/vijefitabukejitowozowan.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/jutabidi.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39346291462.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/dopujifavaserodu.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/resexopipabovutamurigo.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/77667852336.pdfIn PDF document text
    • http://smogy.ru/files/files/bupex.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/kujatujevoris.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/40846891382.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/letiroxaminiseguven.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/54150829881.pdfIn PDF document text
    • https://aayams.com/userfiles/file/jokezojemizubemujawifawa.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/27803880778.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/87059613335.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/rotazujik.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/19903533207.pdfIn PDF document text
    • https://olajpark.hu/files/files/ralowofulo.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/pewadiletivino.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0930697001631185391.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_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 18608 bytes
SHA-256: b682482363606ad72e21a6f682df6f6a576543683ac96614eed355f928a74d69
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 10980 bytes
SHA-256: e9e1695f19ec84d46cd7004aef6fa143556b5cee55a5b4a3bf6012bacb52155f

Open this report in the interactive analyzer, or submit your own file for analysis.