Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84c4e47f4e5fb1d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 12:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dda469788929e9bd0a64fe739e986c5d SHA-1: 5bc0cc6572fd2ce4bc896db4f3e1de018ae0b22a SHA-256: a84c4e47f4e5fb1d9e49993e03925d92ccb8dd35930eb9496cfcbd9680cb0a71
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. One URL specifically mentions 'download lightroom 5.7 1 full crack 64 bit', indicating a lure for pirated software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://eatoceanic.iorderfoods.com/uploads/files/pefipukigiwopusematuzukub.pdf In PDF document text
    • https://open-call.fr/uploaded/files/80148999521.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091205301873499.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/38031233489.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/vukut.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/gotaxedunavexexabi.pdfIn PDF document text
    • https://diphong.com/uploads/nenexasaka.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613668fa574ca---73347373419.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/90388562643.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/luvizikovetadi.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902165924_1743654056.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/82286946203.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/94856815606.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/likurogenipitisavolagi.pdfIn PDF document text
    • http://efrex.cz/files/file/46143913599.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/vuxipesexugobuxusufun.pdfIn PDF document text
    • http://getdol.com/page_data/file/80713674976.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142244ca95db---feberotarerava.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/fudapukos.pdfIn PDF document text
    • https://korankertas.com/contents/files/desererisudewijetabukawa.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/sotexokixefiwojasoxojik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+lightroom+5.7+1+full+crack+64+bitPDF 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_off0000c2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A7 18416 bytes
SHA-256: ca7fd2fcea3a1bcd2d838e30a06bd304ecc96d4e6cee3cfb3c63dd32f00bc97c
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 11592 bytes
SHA-256: 0f7641be0ddbe6ccbdebef31c3331cf84febb4e151d1a0c6881c118440f32b6d
font_02_sfnt_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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