Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dadeafba3835bba…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 02:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d24e3201bb37c43c3a0ad50e39d06779 SHA-1: 1d16d6d41efb5156a894c32c4ea8b379ec0f4390 SHA-256: 4dadeafba3835bba9880b2aac6a1c883f70de47c632743b0627f28e59f90b1ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to other PDF files, indicating a link farm designed to obscure the true malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of unknown reputation URLs strongly suggest a phishing or malware distribution scheme. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fajndoktor.cz/images/file/files/galawewozapa.pdf In PDF document text
    • http://fecirturizm.com/resimler/files/berozagumupakutapom.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/rufifimofofuwatigemi.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/28125164581.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/89231142727.pdfIn PDF document text
    • https://phm.vn/upload/files/jaxipasulegogijalizegome.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/22537991516.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dexibep.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/nifububajorogebatazo.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/63987291802.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/84154871563.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/wijaforufaromewi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384b10708a5---61588398737.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/15706876370.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/30894390317.pdfIn PDF document text
    • http://mq-water.net/upload/16965119704.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/lofubeporojoboluji.pdfIn PDF document text
    • http://saktigroup.in/uploads/82191996909.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/5475191367.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4osueo7b6vr1ukrgfdrbg7lrgb/zixojuredixipaf.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/21035730348.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/14947346354.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/41643998233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+ikev2+vpn+clientPDF 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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 18312 bytes
SHA-256: c2f636ac5e67c9c22e6ca9945e264fb1c2d3b3e768e23f528d12f9e63fcbd534
font_01_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 10436 bytes
SHA-256: 460e1513b780f0d5434682dd4062d3d6ec19335498d190d722b938ef849433db

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