Malicious PDF — malware analysis report

Static analysis result for SHA-256 5244df28d9c449c8…

MALICIOUS

PDF

79.9 KB Created: 2021-05-12 01:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3c4741ec8cad7caf77ae118d3390ece5 SHA-1: aa88e2b83e29b5fba2cdcbe5c5d41be5c7cfed8d SHA-256: 5244df28d9c449c8a5fe40380b6fd29c3d986845761ca08259d74c5780df9908
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is dafemum.ru, which is likely used to host phishing content or distribute further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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/strik?utm_term=kenmore+he2+plus+washer+f28+error+code In PDF document text
    • https://melejorun.weebly.com/uploads/1/3/0/7/130775242/7fbe72bd4af.pdfIn PDF document text
    • https://vogadebu.weebly.com/uploads/1/3/4/7/134723944/xikok_govatoxisepurev_livudoxije.pdfIn PDF document text
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/vujemaduruguxux.pdfIn PDF document text
    • http://senigudalow.iblogger.org/napixirixu.pdfIn PDF document text
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/2694891.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/9330683.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/sixakuxeridofezej.pdfIn PDF document text
    • https://dinadexoliba.weebly.com/uploads/1/3/6/0/136091941/3215965.pdfIn PDF document text
    • https://mikiwugatuvul.weebly.com/uploads/1/3/5/3/135318334/minov-misajukufosaje-lopanutexud.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/turitisaxeribelur.pdfIn PDF document text
    • https://xoxisosozujuna.weebly.com/uploads/1/3/2/6/132680853/savenanog-wojuwebojemipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_03f9d515c62f474796ff4b1a0f32b2bf.pdf?index=trueIn PDF document text
    • http://kabekexivebinef.epizy.com/nespresso_vertuoline_pods_costco.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/63231503913.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/prayers_rout_demons_break_curses.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/blacklist_number_android.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_24545975388b4e22a59500e33ecf88e5.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_e149ecdc2f60444d8cc5d154ae16ea3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/82644211218.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/new_hd_movies_bollywood_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/tometuxuxugizagovesu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/serimez.pdfIn PDF document text
    • http://lironif.epizy.com/allaitement_maternel.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/watefojori.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_e0cca9e3f01e4d6f837b2708987eeffb.pdf?index=trueIn PDF document text
    • http://dikifewusexo.rf.gd/technivorm_moccamaster_kbt_review.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 5780 bytes
SHA-256: 8257412511b4f5341bc4bfc45a29cfaa4d100da0ad712e222e1ee3951f7a67d9
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 10836 bytes
SHA-256: c406e99462d4c207451191702c94f22ee0b7c1c06e732ec0a590e161527fd459

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