Malicious PDF — malware analysis report

Static analysis result for SHA-256 e976afdc367229c5…

MALICIOUS

PDF

76.8 KB Created: 2021-02-23 18:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ca5ae51f90eaff7fe8d5cc8c0e7c6c3c SHA-1: 4a286c9499b02a0b1f62f34945dccf3b91bbd2cc SHA-256: e976afdc367229c5ee4411b6dfc4be0767da2d4373108f69e8c6d66b65a169c2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to redirector infrastructure, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/wb?keyword=ms%20excel%202007%20tutorial%20pdf%20with%20examples In PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_603249cb1a72f.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/jevep-jojapisade-lotuzopopipo-kurujumin.pdfIn PDF document text
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/piguzinupuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_60282c7ed6c64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391331/normal_6006206778a29.pdfIn PDF document text
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/pinoruvoxo-merixa-fawufovoki-besozowanil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_6012528855b97.pdfIn PDF document text
    • http://nuzenupezebep.iblogger.org/chalkboard_template_photoshop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/83129346957.pdfIn PDF document text
    • http://saraxafizopib.rf.gd/digital_marketing_social_media_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/gugesufabomozulixax.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/senior_android_developer_salary_in_dubai.pdfIn PDF document text
    • http://dixolasafu.epizy.com/tepunuwipuvinogexizar.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/56243038254.pdfIn PDF document text
    • http://duximepameme.epizy.com/afda_mean_median_mode_range_practice_worksheet_answers.pdfIn PDF document text
    • http://wagivuxofoz.rf.gd/41563238453.pdfIn PDF document text
    • http://wukazenavezexeg.rf.gd/guide_touristique_genes_italie.pdfIn PDF document text
    • http://jixenefotudak.epizy.com/hey_there_delilah_sheet_music_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/adb_install_apk_update.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 5912 bytes
SHA-256: 216ab16a8ab3f4c88e66121aefe3982981d688193ccc01a979c31e3d58379e9c
font_01_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 10804 bytes
SHA-256: b205a4a5f61e63dba0799ea72a7054bcd2e24041ba1cb0a853a62cb136a7d2ab

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