Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd31622f071101d9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 12:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67136f9e1f58c5c3c33c95008c5b0e93 SHA-1: c81e09cb556353dd62a02e7379c05ff1343e73cc SHA-256: fd31622f071101d93f5c1408afc600fe5e82f44573022ff4d8e77699e1e8e477
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating the PDF's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://thanhlapcongtykiengiang.com/upload/ck/files/diker.pdf In PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/jazatubafesijuzuvulavu.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/13377129954.pdfIn PDF document text
    • http://ternovykh.ru/content/file/zoviwusi.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sidit.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/76784537238.pdfIn PDF document text
    • http://z500.si/files/vekofutape.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mapuduxuzatimeti.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210916091427.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/90514240935.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/potewofegeselorofevoribi.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/diwokimowamirerulis.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/wuselagorudu.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/detuxoliwasawadili.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/12839766491.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/30417113660.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/rupuboritulobasumutuzapa.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gironeridenexepa.pdfIn PDF document text
    • https://akemi.ro/hirek/file/54600138119.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/6066152777.pdfIn PDF document text
    • http://matras-devison.com/upload/file/120885488.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/93825591570.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614200043b63f---kipedisafagatifalifija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pubg+new+state+apk+betaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 17340 bytes
SHA-256: e16fde2b9eba64010271cb8f87959381039825a20d390d6ac160891f81ef4513
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 10488 bytes
SHA-256: cfce0a5a089342630a75abc85b791bdfc2b3335a935674241a08f9f670660e04

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