Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a88f0b65fc0889…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 14:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a487663a9f4ff514c9c665e4c70cce74 SHA-1: cdaf31fc4f5ce8067bb21e675eec139ad44cb6f6 SHA-256: 62a88f0b65fc08893a5b04c00160905fb2ad5b8b1c760cb8fcba1ace5960b86b
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a large number of links on disposable hosting, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://skoleniridicubrno.cz/ckfinder/userfiles/files/57953764478.pdf In PDF document text
    • http://chiangmai-esc.net/user_img/files/82510932532.pdfIn PDF document text
    • https://attack.lt/images/files/16412009458.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/lubalaxutunakimarokolata.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/89489737604.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/fisasulowexumate.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/xekiwemanumunupatak.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/gusebede.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nakomotonemis.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3b421beb---18621659014.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/3886489401.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/zuparikokokobeni.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/forawilebu.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/zupifumovija.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/4362060634.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/zibujizuziwazuzixulivokog.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210912203304.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2cdbae3c8ac34b7c8d16f9403b598eef/2903925358.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/99111943214.pdfIn PDF document text
    • https://tarsiman.ee/files/file/48831913099.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/79752968608.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vixufonedozuvataxali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=update+alight+motion+pro+2020PDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 10920 bytes
SHA-256: 0a38ae6a83e7dac89bb26bf771f222b4c15c6d9ad4873a717aeac45a454f5c86
font_01_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 17264 bytes
SHA-256: 6db255ed7667a1df77d908be2c3fbb89716fcb62e957c9d7d7cedf23ba7f5949
font_02_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1