Malicious PDF — malware analysis report

Static analysis result for SHA-256 a041c1b0c4d3f74c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 22:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8178a19b9647afc80a3d658738f64224 SHA-1: ff4cc15d06e4693ec1ecfea976c01693a58ccdd7 SHA-256: a041c1b0c4d3f74c8e252d8c9d6a2d1c05d55d7498f7dbf8ff89f6084f121b3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a network of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://norservis.com/files/files/53702610753.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c469b9646---34051588262.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/vetimumita.pdfIn PDF document text
    • http://trovas.com/userimages/1504711032.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/28663820421.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/xupumiwitujelavidig.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/kilemejesiligevifilak.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/nakalutowovelupa.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/13601346934.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/luwelija.pdfIn PDF document text
    • https://dalba.net/other_files/File/lizoxazukixedab.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/61215760356.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161407c7542fdb---suteje.pdfIn PDF document text
    • http://iknow.pl/files/file/werekinekofa.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/91245570043.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/benasenunatak.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906024531.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/bolufiposed.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/67587317956.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/82370721204.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///zozejotafuzafubidaxuduri.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/65398632539.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/92450431032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+android+app+store+in+chinaPDF 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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 10616 bytes
SHA-256: 03e16b55b18efcc204478162d4a02a0a517b8bdd0be275b50a6a152178c9b3d2
font_01_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 17280 bytes
SHA-256: 5dc337a7a4ce6d43bcdfcc0400608e7945ac35d9a09fdd6285c43a7ce62e32c4

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