Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9127254a9a56493…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 10:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40737a55d3f400fd8d42e27c9785c34f SHA-1: 161bbfc5ed10bbb5992e81bf693f6213584ba7ac SHA-256: c9127254a9a564933d10aea28c96b3b7e7fdf0f2d0b5fbb4725fc3dac1f7133a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=beatmaker+android+apk PDF link annotation
    • http://kanomax-nsk.ru/images/zapafilaleso.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/notugigogalapuga.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/mipajolozumujesamugit.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/31934570143.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/xukumaguwotuwagazi.pdfIn PDF document text
    • http://keramann.ru/uploads/files/vizuwugudojezuziguj.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/61721935792.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/34021973564.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/19104026746.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/mefokeb.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/33238751455.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wiwov.pdfIn PDF document text
    • https://apra.pl/files/file/zutulolavutufuja.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/xuwuxo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16142de942b61c---rixuxivogewawajurutaxezav.pdfIn PDF document text
    • https://soechi.net/userfiles/file/51840355075.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/45111298640.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/5517941348.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/fazufoza.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/tobitisukikas.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/zabetifumorapemijix.pdfIn PDF document text
    • http://vhktn.at/images/content/files/guxuk.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/dopazixujefijobikizatas.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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 10484 bytes
SHA-256: 104c2a4fb7b0fc853f66b48df1b5a42219f6e9f0dcad6f5b4c22e9cfa35b3999
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 17148 bytes
SHA-256: 9d6085e0b6f8078b779452e78fcf49ba534a3d015e25a0ea8d259c9989241654
font_02_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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