Malicious PDF — malware analysis report

Static analysis result for SHA-256 018cc0715e8a2c7a…

MALICIOUS

PDF

88.5 KB Created: 2021-09-21 04:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5d80f4604e547f53dcf35de7fecbbef SHA-1: bc7083331b21c547bb3ff849f003257322c0dae7 SHA-256: 018cc0715e8a2c7a98af37517877cda27be79b50cc3d961a3d6ca329d3c0dcd5
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. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, forming a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious intent by distributing links across many domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://implant-drill.com/userfiles/file/63227057245.pdf In PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/xizaz.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/72104180178.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/deruwiti.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/jetovapowu.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/36344750711.pdfIn PDF document text
    • http://renknh.com/ckupload/files/siwekadixobu.pdfIn PDF document text
    • http://artediapharma.com/upload/files/venonakixela.pdfIn PDF document text
    • https://cartolmania.it/file/bubezazapevekizizuweto.pdfIn PDF document text
    • https://subded.org/userfiles/file/65389294364.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70012863410.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/sawawu.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/xifidarulosibi.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/numematifowerera.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/tuvesubaxib.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/37000511139.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/nivowidagudaripitisoja.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/jomogamomirumevo.pdfIn PDF document text
    • https://kimcert.com/E/file/wifeku.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/lutilokemozo.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/5900738043.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fec2db43648b947527539cc0a8184fb8/lovunanufivapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=arab+store+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/rigulikawapuw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 23872 bytes
SHA-256: e99022f047b3d3225a25186aec2814d988d53dd67194301a1a22cb9b28104bac
font_01_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001353f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00013d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3C 10216 bytes
SHA-256: fc2cc1fef0c5997266a32b5187e8a0193db4ebd4e5c0516f843a53679c13b13e

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