Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b05c898bc123c3d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 06:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2df828bb08020d9bdbe4624958d6128 SHA-1: 7acc7c5029c06ddb4804a0736b8c1338a9742c65 SHA-256: 4b05c898bc123c3dfe4a8ccead2cc85e18e5804ecdd0627d8e757af88b01b185
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 by the 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on external domains. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm the malicious nature of the file, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=easy+origami+heart+bookmark
    • http://fetizona.iblogger.org/vefewuxavulinowovib.pdf
    • https://vurigejowuzebad.weebly.com/uploads/1/3/3/9/133997249/zitolelurude.pdf
    • http://volosaty100.xyz/2008_jeep_grand_cherokee_overland_dieselqgqzk.pdf
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/7453053.pdf
    • https://gedamalemomomig.weebly.com/uploads/1/3/4/5/134504316/7359965.pdf
    • https://cdn.sqhk.co/vegeboranida/ja0idgh/29062454972.pdf
    • https://cdn.sqhk.co/rozesivotix/f6giGjf/60623180468.pdf
    • https://jusatupu.weebly.com/uploads/1/3/4/6/134652681/4990468.pdf
    • http://ppl-nutrshopfit.website/juzasinilubasubilotad158r8.pdf
    • https://cdn.sqhk.co/jutusaxibu/jfhf5hb/kotidinevanorenulexu.pdf
    • https://cdn.sqhk.co/zewapoxi/PiemH7M/rovusasikidamov.pdf
    • https://sovokuragul.weebly.com/uploads/1/3/2/8/132814371/1598857.pdf
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/fepapinim_rujamoj_fabewazefuso_mipavopubuka.pdf
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/xumozaritada_dufor.pdf
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/9ef01d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://najubizep.epizy.com/57160331495.pdf
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_b09997301fd4455b8da9bf99d7c4a542.pdf?index=true
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_9b465460ce6d4c37bcc50664eaeec95e.pdf?index=true
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_41e7eccf1faf44d186d7ba7f59d11d7a.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_off0000ec61.bin
4dd2b6b7fcffefc4bf22d2a52574df0e910b7930af1bb61fb7d662ce1f8093af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5328 bytes
font_01_sfnt_off0000fe68.bin
3562a28939eb1434ca4b1836fc19aefeee07ff5d21c7900de98119522b03c74b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 10540 bytes

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