Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44a0d9b46473cf0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 00:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2656118c888397f10f30375e285700e7 SHA-1: 3ff2e37b5615bc1cea9c42679588ad934282198b SHA-256: b44a0d9b46473cf0b05c1f7d97880cb9c8e9de37009255031ff7bbef8b531a84
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=rfs+real+flight+simulator+download+apk PDF link annotation
    • http://bulk-supplies.com/userfiles/files/zozotuwisadonenemajij.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/526706708.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/12404313472.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcc4bea83---77704648970.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/77600129796.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/xedifixalimofid.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/97312060360.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/63435135323.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/97842420087.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/3315413371.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/lojarudufa.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/zotidalopisafiba.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nafoxojavolabotowat.pdfIn PDF document text
    • http://industrialdevices.in/uploads/23884662469.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/lisagokazitovifiluju.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/96433915389.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/73129059535.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210905000122.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/82776064135.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bevakumedakikov.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137efd7954dc---98093875236.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/23489116032.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/wodufosifinofusezijipa.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/14302487743.pdfIn PDF document text
    • http://vodnik48.ru/content/file/nilenizonetagotesof.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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 11268 bytes
SHA-256: db6326c7889b07aad0f683788c1613d013dadeaee770a5b8c2c88620feb9d04a
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 16924 bytes
SHA-256: b32684d5157a87fd3e1d50e4254ae1a62f37444f645ca3c948b6f6b0537ce091
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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