Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70d897f410edaae…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 06:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f7b72defe8d1839ab8822b4a2ffaf01 SHA-1: 74e4f9a0cab25b1bba770da70693fe185299b744 SHA-256: e70d897f410edaae06709c3a1494f2c22dc31afee898a906ffa0bf9ef91bc3e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination by using many distinct hosts and potentially UTM parameters for tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=most+used+camera+app+for+android PDF link annotation
    • http://flightshop.jp/images/blog/file/72460265206.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/patuwefowojuxafe.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/48339644855.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/beneronuwiridi.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/junepijejib.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tuzowisakekedo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc28088383---lifozukibetibebil.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/31239779655.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/78686115049.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/57699454852.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/48583214648.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/33225473221.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/vadupexiroxiwoduvuwowow.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/maxoragigukumap.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906133811278218.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/vawesukeno.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/78668101277.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/gikug.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/63164054440.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/69810050623.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixukukipi.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/25806013205.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e4cc6ea8f0f48926d7bb2c1edfe96196/45562460630.pdfIn PDF document text
    • http://keitbg.com/images/files/10217099512.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_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 17668 bytes
SHA-256: 48de779c682f682bff3c0c8ecafba850ddb632ba739172e3145b69a6b57afa58
font_01_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 10828 bytes
SHA-256: 23860a31ed1f13e6cfab461136d96328433dd6bb3c7e8368f77dbce8a0009464

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