Malicious PDF — malware analysis report

Static analysis result for SHA-256 71feba6090259656…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 20:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2304021763f8ba201015fe87ed1e8dcd SHA-1: 9da7b2a95369376c4840894196c41f3d9470c70d SHA-256: 71feba6090259656bffa4398c526c0faaff5b4a3de6eaf1651d6cccf2e7c5490
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings suggest a phishing or scam lure.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://homearcky.nl/userfiles/file/51439279353.pdf In PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/35290182820.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83133094225.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/87896506159.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/bekeruxajej.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/44857991801.pdfIn PDF document text
    • http://belv.ru/userfiles/file/55068315449.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/90682696374.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/jejefujakanoxarawi.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/wagerotudawuwifi.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/rajoro.pdfIn PDF document text
    • https://beautydent.hu/editor_up/42934594907.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/domigozit.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/zijimekazowajokebiguwax.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/peviwivuxojuzuro.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d6b6edcd5f3b28904b2aef6f356a53e0/xerogivupux.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/29388759723.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/warovunibazekoge.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/luseluxemaromenufidowatul.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/76777688634.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/bapebukatubenekepe.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/80186862330.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/worowasa.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/jorijaxuxera.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/96128346497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=phone+qr+codePDF 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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10048 bytes
SHA-256: 1d84379452385b3ea912bbec725001a2b7c876a9933a9dd9025a824ecf497744
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 17700 bytes
SHA-256: 826d045861fc376e64bcd1a98a08725aa5d1f1b2c5d0158bcc1c5698fb90602f
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1