Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc35bb55405fa3fe…

MALICIOUS

PDF

97.4 KB Created: 2021-03-16 09:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6ea5c2394686b688379cf919525f9006 SHA-1: ea340d3ab97f52ce3c14308d82efc15d56cba8cf SHA-256: dc35bb55405fa3fe206ef6795f12b0bfc9babe7158893d7086e3cd74e4b1e9b9
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 of which point to known malicious redirector infrastructure or are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yafferge.ru/strik?utm_term=tres+metros+sobre+el+cielo+2+pelicula+completa+online+hd In PDF document text
    • https://cdn.sqhk.co/batovafakupo/dij7Rib/download_pocket_arcade_story_dx_full_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_600a580a25f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_601f01911e972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_6028fcdeaff90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_6004b62c94378.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/mhj71xI/23396461234.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/hf7Djci/new_buildings_in_dubai_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5feea517270ef.pdfIn PDF document text
    • https://bupebilonozopi.weebly.com/uploads/1/3/4/8/134861312/fubitikafiwuzekabawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_5fd8b5e337897.pdfIn PDF document text
    • https://roxuxafuz.weebly.com/uploads/1/3/0/8/130813852/8302738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5fdc51c7ca1e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5fc5b981ce09e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fd0910a34881.pdfIn PDF document text
    • https://cdn.sqhk.co/dozumapufa/haogcgd/slots_of_vegas_real_money_no_deposit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fef7beaa0467.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://uploads.strikinglycdn.com/files/b35945be-ac41-4b02-baab-81f35740eebb/malezavibawed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a6e383-e863-4446-816d-940c0841ceeb/what_was_north_korea_before_kim_il_sung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d4b5a4-2a41-45e1-93ce-0376a502a6f3/58878753439.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013fe3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13FE3 22240 bytes
SHA-256: f2d8220fe4f62642c7bbf686908874a0f1d52331eba95adc2e7c435909b598ed
font_00_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 5416 bytes
SHA-256: be196a0792e21c4628e2ff0167cfa3634e58a6afb64e52a788da3b1dc77281ee
font_01_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 3296 bytes
SHA-256: 529ed054b60061ecd5e4d5ba9f4577eca81e32dbc63df853ac8680b56b88bd9f
font_02_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16424 bytes
SHA-256: 1070dbcc6fea45a039f4c82ca874a5274ea08b558faa24efce3d9ed36ea61a93
font_04_sfnt_off00016735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16735 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3