Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3587e7c8872227a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 21:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 524c5ee4800b53bb4ddcf57e899861a9 SHA-1: 416b6d40c0f8984ad22e0d3cce8b505a29a4ebc1 SHA-256: a3587e7c8872227a05b5d01d0bdc7391d700f90ecb5dc1d5943123c6f7f2ae24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=word+pdf+printer PDF link annotation
    • http://heathrowairporttaxi.website/userfiles/file/nilabufovokolev.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/pametaturoz.pdfIn PDF document text
    • https://vitanov.rs/files/1718941142.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/55060481479.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912185839248408.pdfIn PDF document text
    • http://bociany.sk/media/file/vanibowedetefuvajakusume.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/71266488299.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/5872027458.pdfIn PDF document text
    • http://elskenecologie.nl/files/81896027980.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/3795708896.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/majeragozepugupir.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/44755642490.pdfIn PDF document text
    • https://kimcert.net/E/file/nitenavifedodadikukefiti.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gekisebafabelidekomuradu.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109080630227663.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/78394705631.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/dizepubunovazozakitid.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/8521171382.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/94585843983.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/rukovalegudurekid.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/68174023670.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_off0000c505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC505 10108 bytes
SHA-256: 5f2eff633ca617d5417686d9f1710d6d0e1f4baf7779b41427d99c14ba908bcb
font_01_sfnt_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 15848 bytes
SHA-256: 8c335b54df2f49d7e1308bb1a70caa059c8316ebb04803a94ee000ebe8ed9315
font_02_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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