Malicious PDF — malware analysis report

Static analysis result for SHA-256 582a77a29979c31c…

MALICIOUS

PDF

73.8 KB Created: 2021-10-06 03:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 244c28a1509d4120b1b6b84eb7a2fc75 SHA-1: 558cfcfaea1542efdf3bf5cb40b3afbaa5b901da SHA-256: 582a77a29979c31c0d248e432a6d9194ce02ea070a0216e2849e7435b4d99215
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to a large number of distinct, disposable domains, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure malicious activity. ClamAV detection and ML classification confirm the malicious nature of the file, likely used as a lure for phishing or to distribute further malware. No scripts were extracted, but the structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wib24-admin.de/uploads/file/66031279271.pdf In PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/12051016925.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/zutudimegoraridimubiru.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/lagurevabugudojujesof.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/xijejuvutabakasipufe.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/27133986397.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vavatexebojugi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16154471412b31---fugonabunex.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/68087884320.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/kutadide.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/lanekameku.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/91433495408.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/65207112699.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/99921160450.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/80291653985.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/70886523103.pdfIn PDF document text
    • http://naviway.su/upload/files/25817540588.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907104551103.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/96199602795.pdfIn PDF document text
    • https://inc.pamlskovnik.cz/ckfinder/userfiles/files/85822608455.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/26270727382.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/41250664401.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc35ca37d---mipetevijururusotusok.pdfIn PDF document text
    • http://indemo.pl/Image/files/64621592056.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lawusifivirefege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=1+2+3+4+5+subsetsPDF 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_off0000bddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 17440 bytes
SHA-256: 90d23f900be74d7b8bb1d18d4f8b2e6a1b92623e3bb83ced3ab5ea2f880aa89e
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 10176 bytes
SHA-256: d08dc8d57772d6d2b914107410fb54466e107271a9e830a3d106729c6265eaa8