Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac75cc2cde6af61…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 19:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff6697bcb7ff99532b1764b3d86abc38 SHA-1: f9af16f913a5ec452ace48322644a339c5ce4b19 SHA-256: 5ac75cc2cde6af61a8c0c6b0d32510fd63b70d0377b107f402e22e20f7b2b93f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially suspicious domains, and one heuristic specifically flagged it as a 'link farm on disposable hosting'. This suggests the document's primary purpose is to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alatheir.com/atheirwsfiles/file/1001312911.pdf In PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/jigazuxiluvogomebiv.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/3595775823.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wapapetovokimexo.pdfIn PDF document text
    • https://masukpt1.com/contents/files/43150484165.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/konodedesukijidi.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/92657064118.pdfIn PDF document text
    • http://lex.tj/img/file/kopegabixope.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/42064484506.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109110038148391.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///68219579111.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210906060700827226.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/402db9e81d7eb9cee6c321ed70957654/tabirig.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da74a2cdde---zudapefuxoratiko.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/sujizupadufabigi.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/vuzedezijawetivivetezedoj.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/zisamimanalunudigekisupu.pdfIn PDF document text
    • http://platcometals.com/images/file/wevigovoberaditokoferog.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/46003728975.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/59098411152.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/noparaxemavizi.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/punozulonugelamodumafor.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/96465392900.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/zexawoxise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+api+for+android+app+developmentPDF 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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 10776 bytes
SHA-256: c4b56220c6373285010071943e257d0a0fa507d577207b36f092df8f87f6401f
font_01_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 16620 bytes
SHA-256: 6a74be9c132ed1de9991787b85997aadeebdf7b99b3f01680ee282e812926d47
font_02_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1