Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0970bcefc386d45…

MALICIOUS

PDF

83.5 KB Created: 2020-11-11 18:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 68c80df846dc1790a9222e9e23c9d24c SHA-1: d86772e008e17b71984bef804b468f371caf1749 SHA-256: b0970bcefc386d455ef9daa5c939a426c1fe2659e94ee5a4ad4fe3bbd850472a
214 Risk Score

Malware Insights

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

The file is a PDF containing a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://traffmen.ru/aws?utm_term=tamil+background+music+ringtones'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass of external PDF links, with 'https://uploads.strikinglycdn.com/files/3e9ad19b-bed2-4fa3-87db-f9599e18a886/hill_district_pittsburgh_zip_code.pdf' being the first listed. The ML classifier and ClamAV also flagged the file as malicious, suggesting a phishing or trojan distribution attempt.

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://traffmen.ru/aws?utm_term=tamil+background+music+ringtones In PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/119094.pdfIn PDF document text
    • https://padavosasosak.weebly.com/uploads/1/3/4/6/134632247/tigojulo.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/8925469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9ad19b-bed2-4fa3-87db-f9599e18a886/hill_district_pittsburgh_zip_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a80619-6a50-4ad1-bc28-3e3db9e13a8b/99960532667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ab4140-e99a-4a55-8f3e-8c0f2139690b/reclamation_of_phlan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5292a46-f266-400c-8627-ab624e7b6974/44009906385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601c1bc7-d5ff-4ae7-a495-dfb6bcd0d668/rerelobug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e7c1ae-5512-47ff-9f23-e33d01d715ab/sportcraft_foosball_table_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fabc00b-9fc0-4de4-b6c8-8f008a6f4b71/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c35d4e8-87f7-4031-a8d6-b46184b67032/xufekusufaxulirovajevugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f90c44-eaf6-427f-827d-4c57a600a3ed/48402503954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a855503-7d04-4989-80b2-868dab84ede2/zadotopotol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d0ebbb-2f90-48fb-9857-3dac8dd5b189/puvijelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc35977-0c09-437b-8c77-636996840f53/57806036679.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 5412 bytes
SHA-256: a0e855275e8ce38f3832b745c5979650d68af5d1ed9d7d32219ad306ec383902
font_01_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 8108 bytes
SHA-256: 888bf1964a44bf3db92102e9b7b2c56109395f78775d1ffa96b4dd32e35e5e99
font_02_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 9676 bytes
SHA-256: 340adeb8a2ed574a7da2747e4c4a00dffe340c8e38c872eb3095f96bfda6e0cf
font_03_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 18148 bytes
SHA-256: 94c5cc72b32c47c8a40fb15b6c1119c7afa21fd5bc8743b860232758c5a3303c

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