Malicious PDF — malware analysis report

Static analysis result for SHA-256 445e7b56eb0bc3d9…

MALICIOUS

PDF

74.6 KB Created: 2021-09-27 15:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0093a38e785ab3499e56b6b91200ed6b SHA-1: 0edfa9abf342879e882d81c6a4f697d761c3e5ae SHA-256: 445e7b56eb0bc3d935de3a909c20cc9761540d764d4d1dc8a3064d1639d95ccd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying a link farm on disposable hosting. Although the document body is heavily obfuscated, the presence of external URIs and the overall heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medical-1669.com/userfiles/files/49434714459.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/foxowipuguminokisut.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/aec2650e82270f7baaf5843f1ae56f94/15743456781.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/44810084363.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/83959996331.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/lovotoz.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/memufopalanusolebase.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/9289774850.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/1936318105.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/92527734457.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/pukopubizekapunovu.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nawikow.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/90290610593.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/coktgatqrqi20ufpnjgdf0i57i/61351953029.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/gafofegoxakefi.pdfIn PDF document text
    • http://langyupharm.com/upload/files/kojadazupawilinutuvoto.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/gopenenap.pdfIn PDF document text
    • https://buyafranchise.org/files/files/pusomigenataxuj.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/40995726095.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/6419923621.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/fisipitulobixilirugodu.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/jejomuj.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/20345192203.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/tulolekapozilarogegavuw.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/wisub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+note+8+system+update+miui+12PDF 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_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 18616 bytes
SHA-256: ead65f09668cdaef9d7a59c4cc9090822241c98db45ef73bb7c70617ea095440
font_02_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 11048 bytes
SHA-256: f985fbb25592b8a026d3b10d705a61f2677e6fa852d4b9dd0764c5505a7f78f0