Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e713ef639863fe5…

MALICIOUS

PDF

181.0 KB Created: 2021-09-15 12:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 867628f477f5771c8a35c75866111354 SHA-1: 3f76cc9b65346de6babb1d6d46b91c56f0f03351 SHA-256: 3e713ef639863fe5c8db82c470f7a0fdfe53c6b3b4d2e7e3538e3567b3ee0bb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://catamma.ru/uplcv?utm_term=master+ball+soulsilver+cheat PDF link annotation
    • http://mq-water.net/upload/45059598525.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/wexuretudimijelakod.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/mabako.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/fowinidotunujafaxofik.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/girefivimi.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/14817608872.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/fevasorid.pdfIn PDF document text
    • http://alkanboya.com/files/file///19364207739.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/mubabiputagixuzom.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/xunibijiwetevuzuzafevar.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/xuzugejewuvivoki.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/1543389146.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/tofinetitabiwolevusopizi.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/jawuvesoxijifugulezizi.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/detilomod.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/8812615912.pdfIn PDF document text
    • https://sergiomauri.com/images/file/mixomo.pdfIn PDF document text
    • http://jljemc.com/upload/files/pitaxogaxenofigadox.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/51277841874.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/91936453718.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/kowekanenit.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/53678064974.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lexigazafukone.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_off00025f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F2F 10524 bytes
SHA-256: 6a4dd194a06a0e3d2b668ed9cb65aaf6f8ceaaf3c78e0c1c75bd0ece01e12cfc
font_01_sfnt_off00027758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00028f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28F6A 20232 bytes
SHA-256: 7deda2367bc01fcf5148f3421b97a372295a4044b496678d9a415d1c1cab2406

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