Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a081eb4011af56…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 06:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5170655e6c3b8dacf87b080b39dfb7c SHA-1: 7e97b484e75496a15444fdf543e14200a7410bc9 SHA-256: 44a081eb4011af56756e39d81b727d19828b1db8234d21a9d1073ae3a8660901
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=how+to+create+an+icon+on+android+phone PDF link annotation
    • https://demetraproject.eu/ckfinder/userfiles/files/35820254045.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/53bnk373ou21elvldqvsdse51t/54121139571.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/ruzalekeliladepiduk.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/95554843234.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/90469211602.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/50083344455.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/76040443471.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/94829226028.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/mejilokinanoj.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/jizudixanisuv.pdfIn PDF document text
    • http://heizler.hu/files/file/majofunevetafafupakasug.pdfIn PDF document text
    • https://isleo.com/i_photos/file/69649628895.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/52103376344.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/63756198918.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/suvenuzito.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/4491871529.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/nitiziwowuzezodutegibaz.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/20099813765.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10514375971.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/tejuwuwus.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/55610189150.pdfIn PDF document text
    • http://gro-felix.si/uploads/munep.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134b07fee516---69694683654.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/14421207717.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xasetorojam.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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 17620 bytes
SHA-256: ecb433197692bd9fa7c85cc20c14f543eec5ef45ad0f711418b1875948038f46
font_01_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 10472 bytes
SHA-256: 08b75534d09fde1f5042ac3e0224f53e72a65f6daf489768175a85e4a8921212
font_02_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1