Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad9faee9a49176b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-26 10:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4391adad34dca81ddcc8b78657bf03f SHA-1: 2c12fe4f135255c4db5a29f95d7bc1ab91413255 SHA-256: fad9faee9a49176beed96bd0d5c64e803699e5c56b51b17affedac47b5d99092
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm and contains external URIs. The presence of multiple external URLs, including one pointing to an IP address, suggests an attempt to redirect users to potentially malicious sites for phishing or further payload delivery. No scripts were extracted, but the overall structure and heuristic firings point to a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=battle+of+warships+naval+blitz+hack PDF link annotation
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614732eeb38cc---468817564.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/63211666455.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/tepafasafogepolowixer.pdfIn PDF document text
    • http://mobil-tech.com/files/91583689224.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/41482201186.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kefagil.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/78184872666.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161313829c3bae---18727765833.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/36675896959.pdfIn PDF document text
    • http://spharma.ua/files/file/76271466615.pdfIn PDF document text
    • http://gojjang.com/uploads/files/damatipinolapane.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/pupuje.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/roxulukezajupavuger.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/45173500470.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/99337771065.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090602453270554.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/luwosozoj.pdfPDF link annotation
    • http://samuiluxurytravel.com/Uploads/file/36005774963.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/17297303664.pdfIn PDF document text
    • https://serka.com/serka/upload/files/jizoxumanifuj.pdfIn PDF document text
    • https://bdata.vn/upload/files/fasobazorobo.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/wogafen.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/wonigunudilivux.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/72337939939.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/39759070268.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 20184 bytes
SHA-256: 1d86776721801c57d5a36ad64e98027f5b29c434e7d2c83e95648b65fc5d39ba
font_02_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 11072 bytes
SHA-256: ba7275d6cca0a5db9c4ff2cc9cbe31d1a0cfb6226bed389af4abad07f5f69615