Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff917c8b9a049f21…

MALICIOUS

PDF

74.4 KB Created: 2020-11-21 04:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f580ce3dcf8a78644e4729f4c0eb7118 SHA-1: 1a0a02b9fc9a776f6c007a27d0f956b3acf2ff05 SHA-256: ff917c8b9a049f2125926f6bdd0501895a20266d7de8fb6aa5637330ba8d1887
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains including 'trafftec.ru' and 'naxupezo.weebly.com'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=legal+age+of+consent+in+arkansas+2020
    • https://naxupezo.weebly.com/uploads/1/3/4/3/134350891/boref_viwogawabuzija.pdf
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fa5be8d7af53.pdf
    • https://cdn-cms.f-static.net/uploads/4375196/normal_5f8d326fd42e6.pdf
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f9f108e0bd8b.pdf
    • https://tovalowu.weebly.com/uploads/1/3/4/3/134375552/vogeba_tenanin.pdf
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5f9fc8bb1f162.pdf
    • https://moxiwomalupul.weebly.com/uploads/1/3/4/5/134598527/dc26bfc949b330.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9702b23a-89df-4a81-a19d-5c0d73bc3a7c/thou_shalt_not_die.pdf
    • https://s3.amazonaws.com/xugigabitulu/21409337811.pdf
    • https://uploads.strikinglycdn.com/files/7a8a613d-9cc1-41eb-b2ce-6928478987ec/jijavizakumizinet.pdf
    • https://s3.amazonaws.com/suximawo/93767088885.pdf
    • https://uploads.strikinglycdn.com/files/2a260ae9-4815-41c0-ac8c-0540a08e7d47/the_chronicles_of_narnia_3_full_movie_download_in_english.pdf
    • https://uploads.strikinglycdn.com/files/418dd225-a36c-4677-8b85-547dc7f7e8f4/modelo_de_transbordo_programacion_li.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6c.bin
0516ed1cdc3bc16856473f582cea7474b5e63d0f25165cf7a1301731d77ab4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 5328 bytes
font_01_sfnt_off0000eca7.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 3720 bytes
font_02_sfnt_off0000f80a.bin
820393edcfa4522c2c45c9863aa7e72212b36a7428edb8d3a6717f89cc555a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10520 bytes

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