Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c1f94574799a15…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 16:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0b4da8f17b10028ffe5ade406c130ea SHA-1: a877c05ff072a040cb6eaf214618fe7233c20500 SHA-256: f1c1f94574799a15596a985de6913a0c877ba7c9f8fa9a21a368f26d51e0d1c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO manipulation or to distribute malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://sikahaiphong.com/images/news/files/ziwisupunezus.pdf In PDF document text
    • https://sona3elkhair.com/userfiles/file/tusixilikijefuzaka.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/pibowo.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/13718804368.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/1156965481.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2d4591c3---fimisilusukexixosajilate.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/susavosexosivekawizome.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pilekazitusazodutuwamir.pdfIn PDF document text
    • http://polletnv.be/uploads/files/51601898076.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/41284293929.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/begakop.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/20766095641.pdfIn PDF document text
    • http://insei.eu/userfiles/files/7974248835.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/rejigenigopape.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/lubuxalipiverunonovefum.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/totorek.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/narazunigetexix.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/32204522221.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/37535896889.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/59249046403.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/80963015387.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/fereburajebesuludigozug.pdfIn PDF document text
    • https://abss.pt/userfiles/file/87708220663.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/mexazowiwesikarino.pdfIn PDF document text
    • https://tarsiman.ee/files/file/xenig.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/13184616395.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/28003752537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=basic+human+anatomy+questions+and+answers+pdfPDF 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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 17616 bytes
SHA-256: dd8f2bed4aebc885ee549da0222f326a61d5710e431ba70d019e106a67f07e83
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 11336 bytes
SHA-256: 2aff673dc7623d564f7071317538fbada5f3b45b59158603a0a64c6b1445c1ef
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1