Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad55a5aa855befa8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 20:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08daf42e1fd1eb9f5fa9e9d7afe3696b SHA-1: 3436b13a220cddfe1f928f2838a367eb97bb521b SHA-256: ad55a5aa855befa813c2c382f90bcbe7be212db8c5e9208d3c012f591f5a8e82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

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 https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/717fb2e727402a6f662ae63a1560725d/roleba.pdf In PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/24220373872.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/kijusepanosojukavobizifi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/ramumafen.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/45924211846.pdfIn PDF document text
    • https://mkart.it/uploads/file/ninakerakikonoriwepebed.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/tomatawijigadegavijogepaz.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/nojisaw.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910033409.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/94843279925.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/lupafapavad.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/xopekidupowot.pdfIn PDF document text
    • http://ucokampen.com/media/files/78881382097.pdfIn PDF document text
    • http://riph.pl/userfiles/file/kagiluwitapaxumonasodur.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/favog.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377114055b3---zulugamizigidel.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/nejor.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/nozukefifazepadalemi.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/japinegijumipekiv.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/dazezorov.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/18196133906.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/93271802973.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/difijawesolo.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///kubuvofekubi.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/gefutiwowuliluwudewazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+block+restricted+calls+on+androidPDF 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_off0000b7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FC 10672 bytes
SHA-256: f4cd291a17ab3e3932847708f6294f9cb95ac26861b0fb4f47949b633bfc482e
font_01_sfnt_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 15676 bytes
SHA-256: cb61b3f1fbbe934c3810fc844ee647adf3929b4ca3212e1f0e5d914a30aca1a9
font_02_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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