Malicious PDF — malware analysis report

Static analysis result for SHA-256 4715d40bef32ce10…

MALICIOUS

PDF

76.5 KB Created: 2021-09-12 21:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 696a08eb25c6fb882018c4fdac29b992 SHA-1: 77f2b5ec21520c2c6d5180107f8fae3ec0553194 SHA-256: 4715d40bef32ce107a6ec79a4750b09ec95c90225ea80ea07f359e9f9d88669d
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. This behavior is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://veganogle.es/uploads/ckfinder/files/lilenopa.pdf In PDF document text
    • http://khangvietdn.com/uploads/file/89830998794.pdfIn PDF document text
    • https://italvaping.com/file/87024139887.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/21445257242.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bivaxajuxoludodudajef.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135be091b86f---jepulepumapu.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/xuxiwukubevigolemazanafiz.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/11330897674.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/verababupavux.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/89034904783.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/9390498705.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/97522705341.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/duzininigudez.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kesezilolapunuli.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/3586879377.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/wovifikepikegepaweke.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/43985770316.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19675362090.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/68413426955.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/46523275339.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/86i6ve5c87m66dpofi695drq26/2394372669.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/34013921195.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/biwawibuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+apk+on+android+using+pcPDF 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_off0000c5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EF 17372 bytes
SHA-256: 0f9f5c8c43820de8e62449f8d87fd74317e53943515bb6a15c63b58d40c7651e
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 10828 bytes
SHA-256: e9f6b06e2f50692c6b003a3259a00ef23a06b1467c6e3b80c9d823a36acbdd14