Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e1294316eb9a59…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 09:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52542c5e7c93a3563a992582ce13d966 SHA-1: a2cbce62c7a0798c5a72a39c16b7b2fc4ff7f86b SHA-256: 05e1294316eb9a5905971b2f713ca3c0e7a1a2f7d790ba2eccf121aff4aba2b6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The primary URL points to a PDF hosted on a compromised Italian website, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://autoscuolecasetta.it/userfiles/files/99954849181.pdf In PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109122305376806.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fefikuvinadowu.pdfIn PDF document text
    • https://aitalk.vn/upload/files/negofinelowivibem.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/vatonedovawepijojetutakeg.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/2556003089.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/sejamu.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/texasuga.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109140011403757.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24535684316.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/98347257032.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/62820898751.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/bigizutakesobabamidazif.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/55404406364.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/46990252285.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/46011988860.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/pepebogirakedifuboge.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375b5d97339---tulosekajimowugetaluk.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29694119378.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/nuzulomerawopuzukuliw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161374ae54e18e---41136991211.pdfIn PDF document text
    • http://telektrans.hu/editor_up/satavugigujitetevoturu.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/72449776961.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/72124317616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+iron+king+book+read+onlinePDF 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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 17480 bytes
SHA-256: a95a465972c2d23599d34cc1071c92580fd6583c71459ecb12fdd0204bdd9cb4
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10456 bytes
SHA-256: eda2c68debf97915d6e9cb90c27ef789ab8b66cd9b0e359da9d4d994cd7ec3ba
font_02_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1