Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d51ffc9c316821…

MALICIOUS

PDF

79.3 KB Created: 2021-04-17 06:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73f663ad3e53e51e9925b9e1e99e3509 SHA-1: d04a2733b53ed32bdedc0b9f1fdf82aafab2f4e0 SHA-256: e1d51ffc9c316821389e579f28a9e9dff871f98a5321e03d938cc2c2befdf42d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, but one prominent URL, https://vilenefex.ru/strik?utm_term=scout+guide+book+in+marathi+pdf, is flagged as unknown and is likely part of a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=scout+guide+book+in+marathi+pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/5575090.pdf
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/9007089.pdf
    • https://cdn-cms.f-static.net/uploads/4462351/normal_5fd7b19a095e5.pdf
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fe6eb63a14af.pdf
    • http://wapajag.22web.org/mapa_cajon_del_maipo.pdf
    • https://cdn-cms.f-static.net/uploads/4486033/normal_60372790ce78e.pdf
    • https://nowigusoludi.weebly.com/uploads/1/3/4/2/134266380/4346228.pdf
    • https://vezejajanobel.weebly.com/uploads/1/3/1/6/131606482/453236.pdf
    • https://cdn.sqhk.co/kawurefeki/jfphj7S/25527042182.pdf
    • https://wetugaremuzen.weebly.com/uploads/1/3/5/2/135298520/telijabopuroj.pdf
    • https://cdn.sqhk.co/vekepafate/shheiC9/gre_vocabulary_builder_test_prep_apk.pdf
    • http://xiwotafajiloluf.22web.org/how_to_use_data_science_in_sales.pdf
    • https://cdn.sqhk.co/genamudazunu/amNMjb5/zobitobidu.pdf
    • https://cdn.sqhk.co/sifalavuxozo/NiaVdhi/pay_pmc_tax_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_ffc455d64af146e696a4cd88b71d916f.pdf?index=true
    • http://rerorisa.epizy.com/jingle_bells_sheet_music_for_recorder.pdf
    • http://gojuveri.rf.gd/east_of_eden_book_parents_guide.pdf
    • http://jotirejubano.epizy.com/30819131535.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_4da8e100888049ba939e1a201646912a.pdf?index=true
    • http://dobupefibukin.epizy.com/duribinorofozupuwe.pdf
    • http://delifas.epizy.com/vs_code_angular_html_formatter.pdf
    • http://wovovaj.rf.gd/morokexejalomomunisige.pdf
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_b2220761db8f455e956f0985ac435eaf.pdf?index=true
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_d66f53e429234d4bade4a21a55d60bc1.pdf?index=true
    • http://lawuzuzadi.rf.gd/schema_d_amplificateur_de_puissance.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ac.bin
0eabda419453ee1d006c1f934ccac50fb83ffd9d39d53b7fb89080aa2047d4b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 5664 bytes
font_01_sfnt_off000108c8.bin
52adbf87d1fbeed1449ffdf93b2ccdf511511871caf93f81b94d2789bc446770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 10912 bytes

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