Malicious PDF — malware analysis report

Static analysis result for SHA-256 838962c17c4136a8…

MALICIOUS

PDF

99.3 KB Created: 2021-09-12 14:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42f9a5d7aa01f8a9e424fdf9b9e69be4 SHA-1: 93b8345ab1a5d5ce4016fb212c63d926b7720f94 SHA-256: 838962c17c4136a8742367f42748eaddf631a6f37b03d1bae8256d219f3ae883
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown domains, and one heuristic specifically identifies it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://learn-atdi.com/uploads/files/84234735097.pdf
    • http://libron.pl/fckupload/assets/file/68982935467.pdf
    • https://247christianity.org/fckeditor/userfiles/file/sobifivisefuvopefakig1631056690.pdf
    • http://eternoohydro.com/d/files/pulejibulinofekileb.pdf
    • http://adidravidar.com/ckfinder/userfiles/files/zidexufofuzalavudusojuli.pdf
    • https://creativitagh.com/pevron/www/img/file/lizafibizegofeb.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/61321118440.pdf
    • https://neurondevelopment.org/userfiles/file/37051119253.pdf
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/25114504461.pdf
    • http://pevak.info/UserFiles/File/fizulasat.pdf
    • http://esistore.lu/userfiles/file/bixuvewixafelukanob.pdf
    • http://abacusnancy.com/userfiles/file/toguvotavik.pdf
    • http://szentimresiklos.hu/upload/file/63304909465.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9f98c129---71268572910.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/62140024963.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pn0ufnoo6mn7koie5b3o4vv026/kudapusinijup.pdf
    • http://studiopetrilli.it/userfiles/files/18261136042.pdf
    • https://koparieshorvathbusz.hu/files/file/42511719503.pdf
    • https://dichvuketoanvn.org/uploads/files/99555555598.pdf
    • https://clubesolbra.com/uploads/files/36302577474.pdf
    • http://fiumevivo.it/userfiles/files/vupaganidegegubofoto.pdf
    • http://moristas.com/userfiles/files/gozimixulaxumefigokuto.pdf
    • https://ntc-container.com/upload/files/98941098607.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=m4ufree+tv+movies+tv+shows
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001218a.bin
cef464d05772b28c4cfeda30af9a08018b616845477c3ef03a13f61ace476711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 17680 bytes
font_01_sfnt_off00014f98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F98 16792 bytes
font_02_sfnt_off000167af.bin
bfc6f13a090099f6b24fb412c11a023f32b8a8919a81f760441df66f91795243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167AF 10492 bytes

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