Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fd4dd8ba303323…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 05:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 052e9aefda7240a225eb7fa53eed5533 SHA-1: 37e51010a80fc11c567408541333c408e2d40faf SHA-256: 33fd4dd8ba303323bf7c79baf9d70cad36299767dac627049ba940c225acd430
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic findings point to the document acting as a link farm, presenting numerous URLs to the user, likely as a lure for phishing or malware distribution. While no scripts were directly extracted, the nature of the PDF and the presence of external links suggest it may be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://duvarkagidierzincan.com/userfiles/file/zenusesafovapovura.pdf In PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tesonoxivawofiguloliwe.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/1855802680.pdfIn PDF document text
    • http://vo23.ru/upload/file/68393486025.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021911132991521.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210920065441.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/56290560712.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fuxesepapa.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161356856a34f1---69714634474.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/24024144487.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/zilukukagedorad.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/41300102999.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/91456817063.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/mewafoxibokeropidu.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/lexofanode.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/97106081787.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/86683651612.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jesawufawuniloxixuvame.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/94059333897.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/mamesutixowig.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/fuvoxirukugowasax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nerf+epic+pranks+apk+modPDF 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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10708 bytes
SHA-256: 65594ab5c72fb85b49b29226f39d1add5e949332219fef68df9e892f3ccd3c17
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 17472 bytes
SHA-256: 28a2404117d091416ea856843182d2bfdcffdacc0b93a15a2d36c5073a65a795
font_02_sfnt_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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