Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b301a373c897e9…

MALICIOUS

PDF

82.2 KB Created: 2021-10-08 12:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 640f423e049b9ff83959e9f2abc81012 SHA-1: 209a0332e46ff52b2188dbe33004905af64923dc SHA-256: 81b301a373c897e9391666fc4e87b2031e42736182ae4c9ad6e9a4f89b94da96
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, including one pointing to a raw IP address, indicating a strong intent to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=whos+birthday+is+on+march+21 PDF link annotation
    • https://hondamienbac.vn/userfiles/file/vobudujezumeve.pdfIn PDF document text
    • https://izr.fr/files/80152049677.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/52115963441.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/43347903939.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/ribaxorazu.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/69962515259.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/22774231811.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qvirl5rllmhefegkm2cn0dbqv9/wefivapixisoxusofowolo.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/kaxis.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/92974655661.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/linoxivazatefugaledawi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/sefitumegepisug.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/60589425413.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/vunekimemi.pdfPDF link annotation
    • https://soudurelausiere.ca/upload/editor/file/wexujemotawexetutejukuv.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/sebusoguwe.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/gafepebabusolamusagerel.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/zubaxavulabu.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/8654102620.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/47721454665.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/76084576137.pdfIn PDF document text
    • https://path.mn/userfiles/files/zosogixenowija.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/nobabeboso.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/380285253.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109092337242838.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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10876 bytes
SHA-256: 68b2055b2069a421f01c08b362fcb410563e0a86d5a0a421897981b5c67d5dbb
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 18208 bytes
SHA-256: 59fcd3ff124e064c037a935f77c9231c1e19f946b26774ffcbaeb87574328f0a
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1