Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0b740fa3695222…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 13:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f0b2e1acda62627bcf2f0db2950e933 SHA-1: 029e4b695821bc603d8d3e46f74ff413f1f51143 SHA-256: 5f0b740fa36952223820d5ee227f006866e1f3984b12c03d267e9f079cd95396
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to suspicious domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to distribute links across potentially disposable hosting. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://patrick-jardinage.fr/ckfinder/userfiles/files/kudewifigogububotod.pdf
    • https://proartgaleria.hu/files/files/sekotemuwu.pdf
    • http://gdlianyu.com/uploadfiles/file/64985109333.pdf
    • http://longtra.vn/userfiles/file/24596905494.pdf
    • http://liveisagenix.com/ckfinder/userfiles/files/posamiwiboru.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/34782520622.pdf
    • http://neuchina.org/userfiles/file/jazasotakoworibas.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/37700979606.pdf
    • http://dsfly.com/uploads/files/tuvusevularatasa.pdf
    • http://imosa.asia/uploads/files/202109161310429298.pdf
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokiluvo.pdf
    • https://mamo-tato.ro/userfiles/file/88950828389.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2a5e24ed6ba3195c6291af18f5a599ee/48836325200.pdf
    • http://hasyo.net/files/file/69882840598.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/tevatorifunez.pdf
    • http://pp-aqua.com/userfiles/files/838168378.pdf
    • https://protrialse.eu/files/files/59438332727.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/karudevasutodop.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/lulox.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/munerubezapezivibijulane.pdf
    • http://polimak.pl/userfiles/file/86939553064.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/5612qjss88lqqu2qe1a4b0l994/jowamufatoviza.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/31785814404.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chingamasam+mp3+song+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b699.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB699 16792 bytes
font_01_sfnt_off0000ceb0.bin
53d63f91ed0a38159094cdee46eb27ee5afd8d1dc9dac3be012e4d67b9274a0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 10800 bytes
font_02_sfnt_off0000e733.bin
0bc823b85e3e3c81371dd421a45e76b2d80d18052aaf6822aa1dde0e2efb8d30
pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 15668 bytes