Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0949090d90f558a…

MALICIOUS

PDF

68.4 KB Created: 2020-11-25 18:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c967e4d67a35fa8771ea140e2380964 SHA-1: 142281d244f94273532f6648fcb77c5ec54a132e SHA-256: a0949090d90f558ad7d0c76da261cc767a42bbb0f466a3ddb61c5a557a1eefc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm, suggests an attempt to direct users to potentially harmful websites. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=wakulla+county+dump+hours
    • https://vamibigomez.weebly.com/uploads/1/3/4/4/134438308/f5c15ee47.pdf
    • https://tilobumofiraji.weebly.com/uploads/1/3/4/4/134492377/kujuxo-siwulixebexij-maniwu-dukibuvojorapa.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5f9f58b2d0c44.pdf
    • https://jaxobowes.weebly.com/uploads/1/3/4/5/134591409/xamisuva.pdf
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/dovobi_vuxosanitobasom.pdf
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/basixiralopevajekubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/43cbc702-115c-4862-9657-3fb4514a61d3/88819391611.pdf
    • https://uploads.strikinglycdn.com/files/e9635e6d-48e2-4dae-9704-2419b7724f65/xuwokavuwumilelesafu.pdf
    • https://uploads.strikinglycdn.com/files/057aa3f3-b5e6-4d03-953f-ea717b385b1a/14046524384.pdf
    • https://uploads.strikinglycdn.com/files/1f71eefd-140e-4d21-8a3f-370e9206a08a/dr_and_mrs_vandertrampp.pdf
    • https://uploads.strikinglycdn.com/files/95acf7c6-0855-4cd3-ae19-196a40b4399c/warframe_rule_34_reddit.pdf
    • https://uploads.strikinglycdn.com/files/2097c4b6-ce24-421b-963e-da796ba9f03a/hp_2000_notebook_pc_factory_reset.pdf
    • https://uploads.strikinglycdn.com/files/cbf7460a-0cf4-49bb-823e-dabbd79de4e9/attack_on_titan_torrent.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11c.bin
220141a01babd229a5346e6461d0067e177c049d37008cf68525e2272fec6255		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC11C 5208 bytes
font_01_sfnt_off0000d2a7.bin
8551826c52739e734feb13f31db589f5d7ef51372b85012b67976f3836b64306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 10684 bytes
font_02_sfnt_off0000f718.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 4324 bytes

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