Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58bf05f0692c96c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-28 13:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 327ac6d79eae4c54ebb0ebf95e12ebdc SHA-1: 48f99a4ff340dabe4bb3dddbd67033001dbb0c89 SHA-256: c58bf05f0692c96c47b4e56e04124e5ccbde8f8710806ea31c5968f9321b6810
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a high likelihood of malicious intent, possibly involving JavaScript execution for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://mp-hd.de/data/aktualnosci_imgs/file/wusovewasenenexeke.pdf In PDF document text
    • http://gocep.org/data/userfiles/files/66541452847.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/15u5hgq4l3lsikt5115329gits/fisijubujodab.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/338255900.pdfIn PDF document text
    • http://pi-consulting.ch/download/61642540292.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/rikirarobifef.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/sekibiwev.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/68314018530.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/68205882518.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/36675755492.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/78434771089.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/33735865231.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_24_07_20_52_5932.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909235115.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/45537919679.pdfIn PDF document text
    • https://huanghecables.com/d/files/60074607751.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/24818865280.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/kosutupagalamaripax.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/75396153439.pdfIn PDF document text
    • https://wonkingchina.com/d/files/juxanizupafilisevegib.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/1606753391.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/9904350460.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kj6ltgrmhvbkv2lpehtjtu9u60/52287553515.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/sowajiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cara+kompres+video+di+inshotPDF 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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 10800 bytes
SHA-256: 2d76d47422b871e8b976a3de9c4b1538078f059cba1ef8aafcac8d38a5c46d48
font_02_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 16960 bytes
SHA-256: 0a48f93deaa4f633c56b67e29589182da6aba18413791e5b7dec367388798f0c