Malicious PDF — malware analysis report

Static analysis result for SHA-256 1615ceb2ecd16817…

MALICIOUS

PDF

91.8 KB Created: 2021-03-10 12:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f56a4b8c1c85d5234da0c06303ffbae6 SHA-1: 0ae7b1d0fcdb8d835224440e234dd637dab34392 SHA-256: 1615ceb2ecd1681797556012a66ed5019c6e4b7281b00e29886b6986ecec1204
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://crophysi.ru/wb?keyword=the%20norton%20anthology%20of%20african%20american%20literature%203rd%20edition%20online%20pdf'. Additionally, it features a large number of external PDF links, suggesting a link farm used for SEO manipulation or malware distribution. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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=the%20norton%20anthology%20of%20african%20american%20literature%203rd%20edition%20online%20pdf In PDF document text
    • https://cdn.sqhk.co/makubeku/aiggipy/my_little_pony_harmony_quest_budge_studios_games.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/gowuti_piloleruzosila_kinogejunizok_guzom.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/7jd5hdu/td_auto_finance_late_payment_policy.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/vezug_rimopifa.pdfIn PDF document text
    • https://munivimisidifi.weebly.com/uploads/1/3/4/7/134772296/69cc4181f4d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_604354c58042e.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/maparujopavatexlu1ni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_6020d25caac22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5fd061c65776e.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/c4t4jbO/vimepakewaxebedemimiw.pdfIn PDF document text
    • http://glawerry.online/how_long_does_beef_jerky_take_in_dehydratorcgafq.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/6498541.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/duo_therm_rv_ac_partsccjhq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_6030e3d9a41ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/kenmore_laundry_center_repair.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_631d07b834c34749b44e34cde9e80439.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_6377ef636741491aaf8982c3337bf7e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/putelekireza/friendly_letter_commas_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/what_we_learn_in_mechanical_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/girl_guides_ontario_camps.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/53377424032.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 5488 bytes
SHA-256: 20df199fd85957e8c5d8fc993b6bb82a0fcc8735c1bf22a32980b8625e258b5b
font_01_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 11068 bytes
SHA-256: 7cba2c5d3b450fdd5c805125b88572af11549510ac3706ba9bebeac1cfc18283
font_02_sfnt_off0001511c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511C 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60