Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb41b90b46bb3f5d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-29 03:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8841f07c837335f496d50ed38b5efc0 SHA-1: e4afacd0b38621624400dc63171c375f49329065 SHA-256: bb41b90b46bb3f5d48e858b8cdd3a93ec9c18b90d575c43206d35db1a1959661
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to various domains, suggesting an attempt to obscure the final destination or distribute payloads through a chain of redirects. The primary purpose appears to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://n-zvuk.ru/upload/file/95440004212.pdf In PDF document text
    • http://potya.com/13758081129.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/sogowatonibonadopilalap.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zurifejoporarigubabukego.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/rewedemigamaxat.pdfIn PDF document text
    • https://moolans.com/uploads/files/84802882257.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142325f764db---gafokuder.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/90390958193.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/wivemot.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eff8de515b---25981878392.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/15372654692.pdfIn PDF document text
    • http://mastervin.ru/files/file/25073135464.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/79793892588.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/2965361761378d136923b.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/14632927299.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/65292829487.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/81573958659.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/22501157803.pdfIn PDF document text
    • https://oferta.lt/i/File/saravugumiwavijixidaxa.pdfIn PDF document text
    • http://semanbio.com/upload/files/55314756807.pdfIn PDF document text
    • https://rm-parketi.si/uploads/zizigelik.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zulegigiberolaluwo.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109070256315753.pdfIn PDF document text
    • http://www.heksan.com.pl/file/6488118446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=painting+mediums+listPDF 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_off0000b5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 10472 bytes
SHA-256: 7541fc233acf234ea2cddf774e4bf0898dc183fbdd8f29ca3fbf3e585209efa4
font_02_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 17212 bytes
SHA-256: 03f13b53c0f3923a7fd5132e65fe3051c5d4f11b1051843e015515466c512a44

Open this report in the interactive analyzer, or submit your own file for analysis.