Malicious PDF — malware analysis report

Static analysis result for SHA-256 812b1fe8efd33cd0…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 03:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 53a50f8a8c659d411fa91f88bf238851 SHA-1: eaea470cac14733d714b3fc440059c9b6a318389 SHA-256: 812b1fe8efd33cd0cb1881a7702272c2221658ddf44bd6bcbacc4648e79eba0f
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 0.9973

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://pixomot.ru/uplcv?utm_term=pixel+camera+for+redmi+note+9+pro PDF link annotation
    • https://accu-split.com/userfiles/files/36127853630.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/nalajade.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/9511449225.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/xuget.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/99523998009.pdfIn PDF document text
    • http://frchem.cn/upload/files/lunesivafadafa.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/romopokopesam.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xudajejamoxifinixijuna.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/kenelinimevudipilexumexu.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/25944849624.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/sezaf.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vuwitak.pdfIn PDF document text
    • http://thongthien.vn/upload/files/mukubopedaropakalenedum.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/66076982704.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/pemiwivalibadupubonasegir.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/40378901017.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/65440012687.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/39469474918.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/waxenubesule.pdfIn PDF document text
    • https://adikmanis.com/contents/files/winopolowo.pdfIn PDF document text
    • https://castel.ro/userfiles/file/26346073261.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/zevulugolutanomutugol.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/zizorapeguput.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/zagefoj.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b40e4964---91742030639.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_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 10884 bytes
SHA-256: d6156498453511ea8f9254a2b622c3d79635e519e24d2a81626843774ecb9b7d
font_02_sfnt_off0001281d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281D 20268 bytes
SHA-256: ad1185856ad3c1ee1d1452bdd31ed0b097a8d007a3c1d018e448e1b6a86dac1f

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