PDF malware analysis — malicious · 4e55f7d49f4ce2f6

MALICIOUS

PDF

78.7 KB Created: 2020-11-23 07:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02

MD5: c7836ef0673fecee18192729a2e2c115 SHA-1: e8b26428ab38e3c34728d2d67a5516ee2c58aa63 SHA-256: 4e55f7d49f4ce2f6d65201856ef32cfd7f46b685efca7690b526d728aa9e0cd3

214 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, specifically for containing a large number of external links and redirector infrastructure. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URL points to a known malicious redirector, suggesting an attempt to lure users to a compromised or malicious site. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or redirection attack.

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://traffine.ru/aws?utm_term=twitter+lite+for+ios In PDF document text
- https://cdn-cms.f-static.net/uploads/4384633/normal_5f8c1f5098792.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375353/normal_5f898207804af.pdfIn PDF document text
- https://tumazalewiguta.weebly.com/uploads/1/3/4/7/134755417/godedugesud-daturimemuxed-nowati-fitodo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/0585ec50-ac3e-4ba9-8c47-24a355b84b68/41006209747.pdfIn PDF document text
- https://s3.amazonaws.com/fasanag/turkle_evocative_objects.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/40e52d6b-6706-4747-ba6d-ff8dc1fef4ec/35476618760.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8b06f9fe-f7c2-4c9a-b9c8-18095a19dc1c/bloons_td_3_unblocked_game_world.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/48f86cc3-1e1c-4c3f-8345-978952b4cedb/tulepowonoxujutib.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4dc6b51f-51d4-4efb-ae41-b55cdd04d548/makita_mac700_review.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/652cab9d-62a1-46b4-b2ca-71170f75a3b5/78595843270.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6bcbe7dc-741b-49c7-a071-8746e65d5131/cms_mu_2019_reporting_period.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9ede03c8-7f30-4361-842f-809df1d8403b/neradomifofalusebakibaro.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7086ca70-790d-43f6-ab52-7614539e60a2/43704372995.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1c585b17-f657-4f10-98ce-a788ae5795f2/dewey_decimal_system_games_online.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c93c1787-480f-4f25-8529-006912bcc1b2/solucionari_matematiques_2_batxillerat_mc_graw.pdfIn PDF document text
- https://s3.amazonaws.com/xeponodij/foreshadowing_practice_worksheet.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cc51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC51	6988 bytes
SHA-256: `8ae8c16017d83a56c67560eb3f2758f328086c5836f2968a16ad6d0ee8af3a00`
`font_01_sfnt_off0000e3f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3F6	4592 bytes
SHA-256: `183a5733f6e51abb59998c2ebe1b4fce3d90e481b853c80f6f5c613626a07ba0`
`font_02_sfnt_off0000f3b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3B6	10724 bytes
SHA-256: `d4258bcb8a9248dce30ee5c0fd1bb5ea1b01c91548be2f1f444bdd47baf0ec1e`
`font_03_sfnt_off00011890.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11890	16128 bytes
SHA-256: `5c6af3810a9c1254de8095e854b1011a8ba72abc65dead27a64b45f39b2ebc76`

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