Malicious PDF — malware analysis report

Static analysis result for SHA-256 5deb40ca2953a4c7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 17:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 271eef36fcdf1cbdb6b6895fd8a867dc SHA-1: 1c503df41479127ff46a26d930f9bb6ccd323104 SHA-256: 5deb40ca2953a4c7728f3324d1e1776aa29c1c5ad6411027a4d6c91a14161c72
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains XFA forms and multiple external links, with one link specifically flagged as algorithmically generated, suggesting a phishing or malware distribution attempt. The presence of XFA forms and external links indicates potential exploitation of PDF vulnerabilities or social engineering tactics to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://www.kindspring.org/inc/ckfinder/userfiles/files/46659318003.pdf In PDF document text
    • https://hearing-outlet.com/uploads/files/202109080838219865.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/41321219807.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/nipezinofirijujafugojevi.pdfIn PDF document text
    • http://chemicalengineers.ie/images/11586054006.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/76258128253.pdfIn PDF document text
    • https://sadex.pl/fck/file/74041837424.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/53235271629.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/34168531193.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/sks2fs7h2holsl8adv8238ifmv/74929298328.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/zulubego.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/putukebadosedu.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/sofexupesofezuwe.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/87988631449.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/lopagisuxubavefokikib.pdfIn PDF document text
    • http://runo34.ru/attachments/file/42246117547.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/74392685732.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/32983850743.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/51581411576.pdfIn PDF document text
    • https://hotelcorona.ro/files/lilabosifuvevivudikefal.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/fefuteroxojipukunikola.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/rebebinabomavopob.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dakudepafotepusuveb.pdfIn PDF document text
    • http://lse.hu/userfiles/file/dusomex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=walking+dead+our+world+apkPDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 17704 bytes
SHA-256: 2bf5792a171413418e2c78fb1e03fc59f1aef516f9958eaec12964413327facf
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 10572 bytes
SHA-256: 0deb34edc26b4e3e59fc0bf19be8087f5dec611c63ee9e0256637459cba0837e