Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9582f3164c3ab1…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 18:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 22ec66d8fb3c91bc2a26bbbfe8823274 SHA-1: 4bb51abf7458941f04593bebbd45dd1fd4fbb77c SHA-256: ef9582f3164c3ab19164ec3de7fdddef1613f359a45b02f23edc472d32cf866c
166 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The PDF structure and numerous links indicate an attempt to host and distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bertrandetgastineaudesigners.fr/userfiles/file/jizumataletinap.pdf In PDF document text
    • http://riccaassociati.eu/userfiles/files/55002077225.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/041327095684.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/nutogapofi.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/5602239778.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/medefaxasoduxir.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/64865633657.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/sagijotoxe.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/wupalejurivajonu.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/gelexajax.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/31170014631.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/86162587065.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147a93c09106---396281564.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/83839135226.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/xupife.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/54119379789.pdfIn PDF document text
    • http://agenturamotivace.cz/uploadfiles/file/68355093377.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tirukotokogubutudek.pdfIn PDF document text
    • http://bubb.cn/up_file/file/tinibifatuw.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/26579080471.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kotozulolazutej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=family+feud+app+for+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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 10584 bytes
SHA-256: efeeda03c755bde93500962f6f90897de627e3fa3809391e6e57af82966fc724
font_01_sfnt_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 16808 bytes
SHA-256: 3a7743d3ae96a16d0828b00eb796ba0c73ac55818f11525b379d5b4bd624380e
font_02_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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