Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f584ec771ec565…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 23:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6be3b834d992a4fc1cf0e556735f6a7 SHA-1: fe8567e3c702980cd305d7b51f024ca3017e165e SHA-256: 16f584ec771ec565174d8177af48f16eca786a3b9a1e4026d41d02ab74783adb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF exhibits characteristics of a phishing lure, being image-heavy with a clickable action trigger. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=android+8+dragon+ball+z PDF link annotation
    • https://arerp.kr/data/file///622221771.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/fabolofakarowuzarumibutu.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/deludodopiwino.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/waxipokagik.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/94404621128.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/mamakafiba.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/suzuzaful.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/2636221654.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/sizituvotujifuza.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/filububivuguxopuliga.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/18819301215.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/84373155668.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614111c522d07---4637546583.pdfIn PDF document text
    • https://0900107678.com/upload/file/rogulawazidenej.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/61102327996.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d34170054a---sarelejefebudoletep.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/xovadonerutigijapipijite.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/18243185402.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/gijeguna.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/divolozexaguxazafe.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/22977056359.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/moxajokefutotodozowewese.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/lutofesejasavudutogeva.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/gareborive.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/jivuzeji.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_off0000b373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB373 14204 bytes
SHA-256: a67ae30ab35e4e78f2d02bf61dcd2293cb9d2faea0e782e6c0686dd38a170b09
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 10416 bytes
SHA-256: 33e90547566e6a86c13cb3a605cd30dfe2b9d5a5ec9ab455a8cf6c7ff2e7f707
font_02_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1