Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82b73d0dc676830…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 07:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee9d5664530c8bb46f1b111c14d8cf74 SHA-1: c5a0bee85abd186f7d5025fa6f3eeee73356b3b7 SHA-256: f82b73d0dc676830ff290eac78a8660ec00a0d2250095aa54853e52278cfad09
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous distinct hosts and URLs. The presence of 'utm_term' in one of the URLs suggests a phishing or tracking attempt, likely to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=minecraft+pe+apk+1.12 PDF link annotation
    • http://vssteel1999.com/ckeditor/userfiles/files/gesozusovetisedese.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/38731370399.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/darugopiwi.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/68200400728.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/18261123584.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/19128426639.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/65715476588.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109101004248422.pdfIn PDF document text
    • http://vning.net/filespath/files/20210906204930.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/58544229341.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/pudoteb.pdfIn PDF document text
    • http://cmtsport.com/pliki/jomozililolujeberoxenoda.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/76258903215.pdfIn PDF document text
    • http://wsm.hk/images/files/gomevate.pdfIn PDF document text
    • http://ledins.lv/cms/file/wewopemebol.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/47817719321.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368124684fa---79653951750.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pomaminafu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/91489059429.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/31578353610.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/73018286494.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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 17000 bytes
SHA-256: 8a68721f143ea05b10311f3dab9e62bce6a6c7bbba654c3fbef2631a8bee21d3
font_01_sfnt_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 10464 bytes
SHA-256: 71ddbe4243653738c6b31849d035c9f225f3f3ae42785137a39423218f64c929

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