Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63ae506e1eed2d9…

MALICIOUS

PDF

71.9 KB Created: 2021-10-02 10:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 11ddca247a6286ba16f6a76ad30da01a SHA-1: 0a4defc985e48bc7650766210e85365b92b5f62d SHA-256: a63ae506e1eed2d94d296200e57ba282abaa30019d4838903e5b38fbb501ff6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://neo-net.info/giganet/files/file/31880933905.pdf In PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/50433115129.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/jokokeguwelodiwupidejig.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/redabutixajovujugipu.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/68697214915.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kepovitegi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/01e3dad0d6d6fe551af894024a74f93c/milisevosowuritit.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/sadajibana.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/60021495003.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d65afe8162---faxojofilomuxemano.pdfIn PDF document text
    • https://anaksemut.com/contents/files/77639425051.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/68202933353.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/nutibekafi.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/Bb16SLYaQ3dg.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/61463581356.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-12/20210912173500904385.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/78873080015.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/20162588453.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109300828291793.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/kipafekasawolawa.pdfIn PDF document text
    • http://dmkert.hu/files/file/15752119107.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/durokumogavatosixi.pdfIn PDF document text
    • https://aspirans.com/files/file/33940815575.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/90663049556.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/83205067189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=morton%27s+neuroma+pain+on+top+of+footPDF 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_off0000b380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 10600 bytes
SHA-256: 50bb43799086b8cf2ca3872f61e6998857b245ff37e324ca277b0a3265e7bf5f
font_02_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 17944 bytes
SHA-256: 70765d05c4bce653d872d1d3fab2af92cb55691d6897602f09cc362f143ec440