Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85406a0a1147858…

MALICIOUS

PDF

68.3 KB Created: 2021-09-09 10:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 94bb21569869b4a74be8276641d99f24 SHA-1: e024cf45164b9f129e70b2ae8dd30ebbbb7ad88e SHA-256: a85406a0a1147858c9d191f41cdc361abd5b4689d039892de7a43fd40e564e5e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or employs social engineering. The presence of a link farm with numerous disposable hosts suggests an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://e-district.org/userfiles/file/61914207134.pdf In PDF document text
    • http://gewald.ru/content/Files/3321289284.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/93531514618.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909021349.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/84250778499.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/10398787871.pdfIn PDF document text
    • http://odumakus.com/uploads/files/42240654800.pdfIn PDF document text
    • https://pixel.bg/img/file/32081447506.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/babavoluf.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/16317571083.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47fa312a---16094080692.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/movelavidelorofalugejam.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/xubof.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/mavupemixerabu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/lusakufiweripofaxot.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139082aac689---95644267757.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/040609311540.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lijodutokuwekar.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/50520805873.pdfIn PDF document text
    • http://szpk.hu/_user/file/jujexidu.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/gakumagutatunesabimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=world+cricket+battle+downloadPDF 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_off0000af35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF35 15132 bytes
SHA-256: 11c3f072d9c0493613bff49995b765a5d8e8760c691d8dae319a19c5ac5035ee
font_01_sfnt_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 10508 bytes
SHA-256: 1b8eff3c63f4a9181357a3f2afa7645b21a27a8feb66a1900e15a8d3045c17ff

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