Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fe1e47155d19b5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 01:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ebde2613af6ffa4cba95922ff7b22045 SHA-1: d03b6eb9215d85f9188a20025f486152325a1dcf SHA-256: 71fe1e47155d19b5186b17ee3c8d5b7f2b70ccd7c946e276671a35dd9e7713a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, despite some being marked benign, point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hebrewforreadingcomprehension.com/content/voxugojiwesurawibegeja.pdf In PDF document text
    • http://nyitotthaz.hu/userfiles/files/33287524946.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/39282723679.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/60945834755.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/81856517797.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/66981267222.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/kadutamodigofaxaw.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/mikululudojuwoneruli.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dolevejimu.pdfIn PDF document text
    • http://aweibel.com/Photo/file/25950082353.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sazasot.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sukujuwejapukalel.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/17234455413.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/wagukasovabelev.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0098d8972---tetafimukixatonavorexiz.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/52059670323.pdfIn PDF document text
    • http://chinalabware.net/d/files/tamivuwok.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jagawupifiburewidizetiz.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/1955019006.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/donatu.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/69520559417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gurps+fantasy+folk+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_off0000abca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E1 10612 bytes
SHA-256: 04c91c3ca26210d64f90126f2ce10c246194afd2eeffacdbbe1f01f236cb0f40
font_02_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 16652 bytes
SHA-256: 9e0ecd6a581f32e26f9ee14b74d87c0cc096db6bb2b87d6fd449a2e713b135f3

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