Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a142188c9dc770d…

MALICIOUS

PDF

92.0 KB Created: 2021-09-14 04:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b556e44f8656059a3c74c1540a9022c0 SHA-1: cce4b8276710d50dd52232cc18e0578f333a8b2b SHA-256: 9a142188c9dc770d6872f4c0917462396fed371a76d32c843a449b917665d697
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URLs, many pointing to PDF files on distinct domains, indicating a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues about its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rarahil.org.np/ckfinder/userfiles/files/pazitagam.pdf In PDF document text
    • https://arabadvertise.com/userfiles/files/lixagubalofiw.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/nifip.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-01/55c34f5552000279f272fffe11b2370f.pdfIn PDF document text
    • https://primer-spb.ru/files/files/jurutojekizidatof.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/xoxawudi.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/21008829421.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/kulizaliwidajesezegiwa.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/vodevanikizijar.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/rezagoxone.pdfIn PDF document text
    • http://pjteam.hu/uploads/39314641515.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/7526185719.pdfIn PDF document text
    • http://rayanchem.com/d/files/famodanumebirexejepela.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/26265012869.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/17661076431.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/50190718957.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/62278453000.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/16392474393.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c10bed51---todidawedimuba.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97198825191.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/38011028525.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3fec5b6535bbb076a5a2cee261c45679/gebojefak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=common+words+that+start+with+mPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xevupe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 10452 bytes
SHA-256: 1e6e81e79ed4259058c20754282dc3e3ff870128f6579a31c717699e64427972
font_02_sfnt_off000132cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CB 18796 bytes
SHA-256: b4b1ac1c145090938f0add5486521cad55fa84298d898e74c60aaa39e4370d43