Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d895e831a6f46f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 09:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 445fb20495bbae64a12efc599cada2b0 SHA-1: da70cb9aece138318a0ce4a5a35e8ccf606d8fb2 SHA-256: 76d895e831a6f46f9a0555d46a3198635bb3b10ae93f240f7621b4fc032a9681
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous external URIs pointing to various domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=topografia+aplicada+pdf PDF link annotation
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/devazije.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/tigeb.pdfIn PDF document text
    • http://screen.by/images/file/xejor.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/93952597641.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tugiboxuzakixudadutakod.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/nixipewenepaxujupemenoge.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/51441758557.pdfIn PDF document text
    • http://okun.su/upload/file/43315514760.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906172248.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/jakomuj.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631844676.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/34529485336.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/25030732663.pdfIn PDF document text
    • http://domexpo.ru/up/file/14814379369.pdfIn PDF document text
    • https://braus.uz/images/shared/file/wuwudapatemudenedefezewo.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c3f65bf433083322ec0cd9a2832ce7a1/nawuti.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/15509026573.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/51113760915.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/26687719264.pdfIn PDF document text
    • http://skncn.com/u/files/wefemomesiwuralimoxupuga.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/nenubenada.pdfIn PDF document text
    • https://everestart.com/images/stories/file/gezawud.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/51325881375.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_off0000c26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 16932 bytes
SHA-256: 8473f6ac69b75fcb624c2b80ac406484855427a7f288d317f6b8bf1f4ad295d5
font_02_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10256 bytes
SHA-256: 0ba8f21a27fec6a7c2caeabebc5c8dcecaa2831287095ca5974aa9fa4fee0046

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