Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd4206d8179d272…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 08:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1957d27c7a36d32b399c35a65f36ff8 SHA-1: f8a29c9fe3de283ef07ac5a22a24be3efcb48827 SHA-256: 1dd4206d8179d272ac8e038ddbe6a5f67b4684df173d0d7245c3370b5205379f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with a high-confidence heuristic identifying it as a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=15+sec+adb PDF link annotation
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210906110157.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/tibuzojiniligizisabux.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902213120.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/33125671754.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wekigezubetowofik.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/xedejanilikisarepum.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/bovavegazunasixojumo.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/50563256225.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/fumuwivevu.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/96981097146.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/movogudilopiwewu.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/13214061333.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/redifinanowifoxi.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/32889999204.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/rekupozasezaburedametipid.pdfIn PDF document text
    • https://dintek.eu/uploads/file/kozijonemipodowazitekivu.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_133602.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/venumefikuduzewakuwena.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210925130816.pdfIn PDF document text
    • https://atavio.ru/files/file/55227858643.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ijvttf342rkg1e9fdurmh3lsj/gawimejejinotewogumaxarak.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/nufivadekopexogukajudit.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/dinuxosibulutarawerabarun.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/80186020673.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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 16088 bytes
SHA-256: 813118d3547ba84e00373f20d24b3428bf5328dc800b4e5486295b03a52558e9
font_02_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 10032 bytes
SHA-256: a5430b3481288bc7c485dfcf048ffb532dea97a838fb258308351ec5a67f01db