Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1e83168914885f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 00:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fd064f6986094c54e624f03321aac666 SHA-1: 9a8062794aa9e1d79ca0e5de505d258b963916dc SHA-256: de1e83168914885fe5095499ebacde68b4d8291e04b95f7174c3e9dcb071d1bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=five+nights+at+freddy%27s+sister+location+pc+download PDF link annotation
    • http://bellina.pl/userfiles/file/17956093165.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/konevamifamekewazirinir.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/vavupagalapokenaja.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/kemavuvoni.pdfIn PDF document text
    • https://rosycaffe.com/file/kuxitiwowisanometunokeru.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/64083052323.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zapesi.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/salabiwifekuzele.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fokagititibe.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/tojaxukutonuxejawiwoza.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210917234558.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/wapefaxinudugisedenobete.pdfIn PDF document text
    • https://edusfera.pl/upload/file/40925662793.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/93426716968.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ade1cc2b---tagaz.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/fapifunozulonol.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jijovosuledub.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/22770216992.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/97109771717.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/41451394936.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/nulawuvudewu.pdfIn PDF document text
    • http://herve-coiffure.ci/files/63108498604.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/putowemuxamikimenatuba.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/6801523155.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_off0000b2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C3 11176 bytes
SHA-256: 674dee34d6b15547af5e9f538595b2f2c7a03f39e6bde3e6a8a41edeadc6bf5e
font_01_sfnt_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 14444 bytes
SHA-256: 30dd6d19cdacee383f9258f299da6d5e7ed40f5ed0ad9679fe4fb71433ad6b3b