Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dcbfd7ff776f01…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 17:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 046a5b595e2aa7aad7cd065c6604c1c4 SHA-1: 2f773cb84501787dd4fab40385c4a26c21542c23 SHA-256: 33dcbfd7ff776f018d6052c785f9d7add7948cd4c8feea5b0b465061334cef71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to various domains, indicating a link farm designed to obscure the ultimate destination or to host multiple phishing lures. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://limsurempat.com/contents/files/14896062193.pdf In PDF document text
    • https://weddingitaly.jp/images/file/37474801059.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/29572112567.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/22345221884.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/38343513798.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/66499477392.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/lodemurasarepamizifal.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091922575964.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91558226331.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88383901386.pdfIn PDF document text
    • https://premium-house.uz/images/file/lemebefuzumuj.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xebasine.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/gonalabamarupatumosila.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/lazedifaxorulib.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/korufodelajiruvopitafudo.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/63196761414.pdfIn PDF document text
    • http://esejsc.com/upload/files/69065146290.pdfIn PDF document text
    • http://methese.com/upload/files/43416437830.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/577cce6426e2f917568878b9c07e78f8/tonedegakunelapemup.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/40011005011.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/vivijefivatidobewaxosobu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f786d1ea7a755b0ab7e09bc6dc9dace/tijuwariditemoduxu.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/xufusodapifef.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/92624382705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+cast+android+audio+to+pcPDF 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_off0000b27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27B 14760 bytes
SHA-256: 572fb8777463441c5faf0239f56abfc571b50ddc0a5e82bf8c59f92ac8b043fb
font_01_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 10504 bytes
SHA-256: e315d8b93c3e4008c702c43e99ab4e94cdff90988c0420ed65281b088672678b