Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac39b520359b225…

MALICIOUS

PDF

88.2 KB Created: 2021-03-06 20:38:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d19fe49ae591a2efc8ac78e5567d56b4 SHA-1: d1244fbf4ff8db265c385da83552beb4beee9366 SHA-256: cac39b520359b22521a6b3e54bcefffd507f5a04f6712f8cb17eac598c511c11
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to search queries, suggesting a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/aws?utm_term=stopping+by+woods+on+a+snowy+evening+by+robert+frost+summary+in+hindi In PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_5fe61d81f38dc.pdfIn PDF document text
    • http://trendmobile.ru/77136255771s0ovs.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/zavavirubowivetafig.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/muxuminanulit.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/how_to_find_the_vertex_factored_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_60267d8592f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_600c601d99133.pdfIn PDF document text
    • http://grampus-shop.com/97773056773gvap0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_6029e6ccaa0f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_603b33f1e11b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ff2aa5ad2382.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/did_grandma_get_run_over_by_a_reindeer.pdfIn PDF document text
    • http://drilltech.info/nepimizapiworedoduximef3qn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_60044b5f47919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://widopux.epizy.com/44254355475.pdfIn PDF document text
    • http://sozitemow.epizy.com/frmulas_para_determinar_el_volumen_de_slidos_regulares.pdfIn PDF document text
    • http://lufadavebu.epizy.com/31192146061.pdfIn PDF document text
    • http://xilavivugup.epizy.com/28378911042.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_7557191ca2e14f8aa934cddf7ef2cde2.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_1298bea880484053862d0bdb89f58ca1.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_3f6baa716d6a4121ab0cf4ec13302a81.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_d9d56d37299346608c499223111045fd.pdf?index=trueIn PDF document text
    • http://davofunup.onlinewebshop.net/fubaf.pdfIn PDF document text
    • http://robexede.rf.gd/production_and_operations_analysis_7th_edition_solution_manual.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_25250275228f4dbd898b1797f7840f2f.pdf?index=trueIn 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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 5920 bytes
SHA-256: d86d0303e4d6c70005eac9967604460a4d49b65ebbd9ce066bcffbe037925247
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 10448 bytes
SHA-256: b7e17a635511dac82165d35b8f2a6a78ddd3646d3f23452cf52c77834d4073e4
font_03_sfnt_off00013294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 9224 bytes
SHA-256: 27b442eb6c4033456c03c49a5349e33dd23f95c0c847e443c9c7bd549622f7d1