Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba90ba410c861f15…

MALICIOUS

PDF

97.5 KB Created: 2021-09-12 19:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2916cea6dad10bd8f1af1b826b40835b SHA-1: 7c43522043dc6b34c7293247505ed0b835b8e200 SHA-256: ba90ba410c861f15ed1abbdc45b32b6ecf2dbb4e84258cce33113003b9f7b42c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, some of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=android+studio+program PDF link annotation
    • http://kidneytracker.com/ckfinder/userfiles/files/22511417877.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ud65fomg1n7gst3i8qoffrkep1/dirafisiban.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/navofeg.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/63531792689.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630803023_1.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/35858378384.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/welujematikuragogavak.pdfIn PDF document text
    • https://interconformity.ro/images/file/68405261224.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/48250039301.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/59079919561.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/mubaxomapujoriwij.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/41492201795.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/vufinu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/6944053549.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/wojenib.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/6802509714.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/29689148497.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358bd389ce---40153287486.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/7134233818.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/66979779202.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/ferozasi.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/vireriguxesidopanawur.pdfIn PDF document text
    • http://micruts.org/userfiles/file/39688849499.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_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 10636 bytes
SHA-256: fd818a58ecf7cddc08d0fd72d9f961e16048b3b9138cbb051929e61d823eb929
font_01_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E1 18944 bytes
SHA-256: 49fd5c9680f33a0c5cfc08c630918c9332943e2471a7e033a852d893a04618b8