Malicious PDF — malware analysis report

Static analysis result for SHA-256 088298a2c415b1ea…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 06:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f35f8f2f4e68add762646341ddd9803 SHA-1: 987f5e1b9ae4a82b922a9447b7e89081b3f98312 SHA-256: 088298a2c415b1ea139e46a4141d729a740780e86d3c097c43dc605c4a078a25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://saothienemb.com/uploads/images/files/sarubizinafubavezifa.pdf In PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902051359170397.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/sidijadari.pdfIn PDF document text
    • https://blv.by/upload/editor/files/wefutedisogimak.pdfIn PDF document text
    • http://aquatherm-graz.at/files/romoguxurokidogalekedaw.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795cc2215---78771743088.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/23566423521.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/88757029756.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/28965561918.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/xasikumivoxevuwameruzowop.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/wejupav.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/tamufibedopiniginodupibik.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/mekomejofipetejapira.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/badunoselepozutelavu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/29603255690.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/78151122555.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/738e93b2fa14bdde24014a89b3c969c8/kubanomu.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/17501799643.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/muremo.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/midaxojajotopatib.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/67815147382.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/41847418955.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/bukixinodesa.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/ruxojabojatukopajesogip.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/wuwodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=parts+of+speech+exercises+pdfPDF 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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 18612 bytes
SHA-256: 3d56eadb17b6af62b7c23c85567c7155abc1a7fcb36e6c6429f3646fd9cd7e9a
font_01_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECC 10672 bytes
SHA-256: 504eaf73945242dbe16c0adcb1c81d86743cf4504c2fe64d071395d2c6061508