Malicious PDF — malware analysis report

Static analysis result for SHA-256 522d01f0f1530c67…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 00:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef243bfeccb5d569a4664f98fca781d9 SHA-1: df2d48caf64a43f0c933f03c6e294ddb1d1b03cc SHA-256: 522d01f0f1530c67112ac6e41c3f3e2e3c65a8f8e0396bfaf97eda4c0877366b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to link farms hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using many low-reputation links to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=ascii+heart+copy+and+paste PDF link annotation
    • https://eravukappalpalli.com/userfiles/file/67186358399.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/kopemosuj.pdfIn PDF document text
    • http://119pump.net/d/files/33169960486.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/futuzoxorefeta.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/43978570115.pdfIn PDF document text
    • https://virker-ikke.dk/files/1807026158.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/dunelazite.pdfIn PDF document text
    • https://tsolisp.com/files/file/99837012459.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/kawasubofitigalalonifupe.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/9364746802.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/78229827658.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/78766153775.pdfIn PDF document text
    • https://timminsrenovations.ca/file/aKsGqNipRQroYJIn.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/49796370392.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614198f3aacfc---bafuzededaxumu.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/xabena.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/niputilalasiwon.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/sadek.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/miveda.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/40279968611.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907190521652753.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/tolumirewopupujez.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210914_90DA23B0A15BF889.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/jirugosanipaxus.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_off0000bc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9B 10660 bytes
SHA-256: 60cb0f57daa2997a9921285b9a1be0033b08c1c987a08dd3c477d47e7298e23f
font_01_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 19280 bytes
SHA-256: 86b9ba74329783c856661831f969e5ec6a16ee7a9dd1371b2a45c6dc5108d54e
font_02_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1