Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05c8b47f1ebc4ff…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 19:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 398108d8b77612f69daf005a5446dc6d SHA-1: 87960aae3de54df3541b9b2cb900c6191296cc4f SHA-256: d05c8b47f1ebc4ff8901e9b6aba70c0e88a952ab356ef672c29adda095e556b9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It presents as an image-only document with a click-outward action, typical for tricking users into visiting attacker-controlled URLs. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to disposable domains, reinforces the phishing and link-farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://strings97.hu/userfiles/file/99353883850.pdf In PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/99684122127.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109130207101050.pdfIn PDF document text
    • http://artcvajk.friendship-match.com/upload/files/77070803808.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/gexeb.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/vexajogovali.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/jowusinitabilikosef.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/49063697628.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/gujilu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/21656616604.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/nugenova.pdfIn PDF document text
    • http://sjhtractor.com/d/files/93031054196.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/78a14601658970554f4547d5ac339575/3158057527.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/39511884548.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/baxuvubixamorovifokuna.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/25700301220.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/wuzexerodi.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/pifudosozajixizaxolu.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/85651512792.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/94040803591.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/79109808907.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6d2a92cf---fuvefixabilob.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/95666756860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=online+sd+card+recovery+for+androidPDF 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_off0000add3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD3 10576 bytes
SHA-256: b7b615862e5ad839494a930f9f5a34445ae282a07c6eb793ca8a5f4f48a357f4
font_01_sfnt_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 14480 bytes
SHA-256: 3d0fc8abac4de7ed1d25928ed2dcbc067e709cd3a7029087c227844f9ca918e9
font_02_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1