Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13db9eb01b8dbc3…

MALICIOUS

PDF

73.5 KB Created: 2020-11-25 05:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6c33c51daa17d0cd347549395b2c3772 SHA-1: 75594358b86085642947eb0ea0bfb13892b65624 SHA-256: f13db9eb01b8dbc352472164ed5271621165d674328272ce2306c7d893a83740
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links. One of these links, https://traffnew.ru/strik?utm_term=broad+ripple+high+school+indianapolis+indiana, is flagged as suspicious. The ML classifier and ClamAV also identified this PDF as malicious, suggesting a phishing or malicious content delivery attempt. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffnew.ru/strik?utm_term=broad+ripple+high+school+indianapolis+indiana PDF link annotation
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/5436873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5f92017d29f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5fb6206eaa11d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab11b79d-337f-47e1-bae4-2ea97ad4cb0d/patoduzomofeduleturovadox.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/ballade_no_1_in_g_minor_op_23_partitura.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/fepelebefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ed4717-85e1-4889-a6a7-ad6037dd27b8/invisible_space_fortnite_urbo.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/walosasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71653c0c-bf2b-4bea-90e7-f0355e2e735a/periodic_table_with_oxidation_numbers_and_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1efe82-6d65-45a0-88c1-456e6854d8bf/98903855782.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/domukabojoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73267631-16b4-44ba-a712-d258f2b7e7dc/69412996039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39728ce3-efd8-4579-a8c3-3a35f33c28af/72994009736.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/zepirutevabozudexasoredet.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/raser.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 5384 bytes
SHA-256: ff9471f54926584ded81912ba0c9419de4f4cd809a94adb8f7215c4a030f490c
font_01_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 6656 bytes
SHA-256: dcd21fa308d1fe57950d2ec8666bad97ba6b092f41d8302a82ed03338a0861fa
font_02_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 11676 bytes
SHA-256: 9eaa4f5a54c07e805a86a025e1982f37cdcd6121361d3a8eacd4ba446ae64135

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