Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf0829383d7ef9a…

MALICIOUS

PDF

80.8 KB Created: 2021-03-11 23:29:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4975fd635370a746bdd7dac3a112471 SHA-1: c7c8dd8d93ff1f81b79dd2e36352d10754b5bb53 SHA-256: 3bf0829383d7ef9a860f873642b2290bf12af8c30dd117742ed778b402c822aa
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external websites. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Beamer outer theme default.sty', likely to trick users into visiting the linked malicious domains for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=beamer+outer+theme+default.+sty
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/2569495.pdf
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fd0fc217227c.pdf
    • https://cdn-cms.f-static.net/uploads/4478387/normal_603ff896ae616.pdf
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/8e980099214cef.pdf
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5ffe019e4ca9c.pdf
    • https://static.s123-cdn-static.com/uploads/4367005/normal_5ff2a47776653.pdf
    • https://cdn-cms.f-static.net/uploads/4407807/normal_602a196eb866f.pdf
    • https://cdn-cms.f-static.net/uploads/4459926/normal_602f24d8d0e73.pdf
    • https://cdn-cms.f-static.net/uploads/4369629/normal_602440890ffd8.pdf
    • https://static.s123-cdn-static.com/uploads/4470833/normal_5fe053c6bd8a2.pdf
    • https://cdn-cms.f-static.net/uploads/4495526/normal_602ddd2ecea6e.pdf
    • https://cdn-cms.f-static.net/uploads/4402000/normal_6023c2a781846.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_12bf69442a374d379b88fce8a25da2b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36bfd3f4-2227-4041-8195-7dc007de1ae4/31371852288.pdf
    • https://uploads.strikinglycdn.com/files/641c0adf-4e44-4c60-99d5-779f85cf439b/wizixefofuv.pdf
    • https://uploads.strikinglycdn.com/files/cc4d9eef-f91f-4cf5-82d6-7bed0196106a/90816170664.pdf
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_99f7222f16554ec595e3aac12c11cc7c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8edfc8ec-7c5f-45f7-ab1d-300d9fb2e8f2/robert_anton_wilson_quotes_in_order_to_eat.pdf
    • https://uploads.strikinglycdn.com/files/a51a4809-27d0-4aeb-bbac-f482817232a7/derecho_romano_margadant_libro.pdf
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_dceb36fe9ee34dd2b7d71d2386b1b174.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c601243e-b6e1-4edd-952d-c960a620bfd5/10_mejores_carreras_para_estudiar_en_colombia.pdf
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_0eb7cf6fbded40b38c7e7aa2a22ada46.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb86.bin
7d2f3f234725134dc7cd375e5de9ad4a181a0f5618e67e9026499f36a161560c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 5332 bytes
font_01_sfnt_off00010d88.bin
1d62397119f2382e0e632fc41f360d51953471bd0c8ac9cfa1900317ad92d82e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 11664 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.