Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2734d9ebab2447…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 13:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b2e619206c7f74fa5e1b87c5a6fe4c3 SHA-1: ff1e0eea4473f4845fd9c96a95f4c955f5a3cf93 SHA-256: 1c2734d9ebab2447e991dc3df2aa598ebae8712e05345df98b17e6c7ca72a9d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613431571fe59---mitivarem.pdf In PDF document text
    • http://firesecurity.sk/userfiles/file/lewijikimesok.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/37174770425.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/wiwakiv.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/kowaxup.pdfIn PDF document text
    • http://ip-pharma.net/data/files/resetupedakesapoji.pdfIn PDF document text
    • https://blugarden.eu/file/85277609211.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613887e72de16---91673610549.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/pukonuropuserogewud.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/25167083816.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/zokoxiwaw.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/65231130371.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/99540110353.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/turozotofeziwuxuk.pdfIn PDF document text
    • https://digireg.at/upload/nowozilunolinuta.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/totidodiniwosufagorakogaw.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/mubobafubugononinomo.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/45577145089.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/94843599070.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/28843287244.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/69389777011.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/rokiv.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/godarimupuwubukemewumap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=test+for+tenses+in+english+grammar+with+answers+pdfPDF 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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 18232 bytes
SHA-256: b4170905417c0d915f1d548c3c4fb4c7b9078cc79af58176278ef7d53fffb301
font_02_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 10992 bytes
SHA-256: 7f0d44d53c58c2f201aa395cf84a4256298b3a843494435e271ebb0eee2d3eb9