Malicious PDF — malware analysis report

Static analysis result for SHA-256 55504a9874092244…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 12:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2605b45cc955b2c5b9d10d71503ab58f SHA-1: d0441a528432388f458a9f1335d79945ea3a4652 SHA-256: 55504a98740922440a0f60783f08e8be8eb8c19ba5d43793adfc3ef6c4f64067
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, many of which are hosted on potentially disposable infrastructure. The presence of numerous unknown URLs suggests an attempt to obscure the ultimate destination or to spread across multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiogiamberardino.it/userfiles/files/mapagirub.pdf
    • http://alituncer.com/userfiles/file/webofiro.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/33249241313.pdf
    • http://gekon.net/userfiles/file/tifijibefoxusotirifigu.pdf
    • http://uticachemical.com/files/upload/files/xojotakalem.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/zovegitek.pdf
    • http://buddhavehicle.com/userfiles/file/xisibatogukimesoxe.pdf
    • https://pastelbuilders.com/userfiles/file/39026489785.pdf
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/20f5dc9292b94511a078305a8f183602.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/41269927686.pdf
    • http://nepalbestcargo.com/userfiles/file/dimuxomibomikezulep.pdf
    • http://stihoplet.by/upload/editor/files/59248827092.pdf
    • https://kermanrooz.com/img/files/12459478620.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/46358162347.pdf
    • http://mrs724.ir/basefile/drtiketcom/files/51685594194.pdf
    • https://bandotrading.it/uploads/file/tatikiwoperobajolafe.pdf
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/fugapabilit.pdf
    • http://gardenofsound.com/userfiles/files/wisovasaxaluwenemo.pdf
    • http://cnsgafgl.netsociality.com/upload/files/zusoxim.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/25413315608.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=before+i+met+you+quotes
    • 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_off0000f05b.bin
c5d599c26c09f8cc476404dd0b597974d1ca8a9f09f89be16b1a97d279050d40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 18052 bytes
font_01_sfnt_off00011ee5.bin
e2692e1b3e87c2f21199d3640133c76721c17b0d2412c9fbda85fa3c7dfd2d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 10476 bytes
font_02_sfnt_off000136d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 16792 bytes

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