Malicious PDF — malware analysis report

Static analysis result for SHA-256 58893c4b731b5270…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 08:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cfcd96e7cc4f59dad033bc1b24af51d5 SHA-1: 9f1d7e489a5d4c49bb83910ce0998ed2617ea7a3 SHA-256: 58893c4b731b5270933f29d4c2ed3fcc4c8d4fa42d29c24650effce4708de3d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, some of which are hosted on domains that appear to be link farms. The PDF structure and heuristic firings suggest it is designed to redirect users to these sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://donauwell.at/userfiles/file/80036813811.pdf In PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/wuvosumezoxakakoxala.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/52943125487.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/14086242254.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/fomaxajelal.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/vubizikesezuj.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/20523625637.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/sovoxapajunozomumolo.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/72063239369.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wanefuxoraderujajiraz.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/sibip.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wujetekuwigufuzozarepaw.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/46360547565.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210910_E649B9C7EEC7B094.pdfIn PDF document text
    • http://watch62.ru/files/files/barova.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/zazawepepinarizi.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/23583779464.pdfIn PDF document text
    • https://uangraja.com/contents/files/86244016965.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614432e3dad79---17654437918.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/68393970028.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/19416824377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=john+wick+2+download+in+isaiminiPDF 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_off0000ae7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7A 16308 bytes
SHA-256: ca6052ad7874aa95c92849218b9a5f91e4a404d368827bcd522a2ccda20796a4
font_01_sfnt_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 10596 bytes
SHA-256: 681cab02a21280f5cff4f70e99558e991afae75ae159418a3e0b67b792d822fc

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