Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5c592945449cc2…

MALICIOUS

PDF

131.0 KB Created: 2021-06-13 18:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04b6e5daf79689365df6f8cb11a4f48f SHA-1: 57848b30c0691a8cf78bd3aa1c2fb45a8e799676 SHA-256: ec5c592945449cc27bcda140597a4cdbc1f59de99125b828e1e21d5d54cefa39
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection attack, likely intended to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://cructi.ru/pbw?utm_term=twilight+1+full+movie+english+subtitles PDF link annotation
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/sapuvofemujidapodav.pdfIn PDF document text
    • https://miwunogix.weebly.com/uploads/1/3/2/8/132814940/jukozadikes-fakoronurasure-demow-siwusirozozagom.pdfIn PDF document text
    • https://daxogane.weebly.com/uploads/1/3/2/8/132815110/b0da1db6.pdfIn PDF document text
    • https://nekawosewifij.weebly.com/uploads/1/3/2/8/132815774/d9e938e8.pdfIn PDF document text
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/nejitedozosonasu.pdfIn PDF document text
    • https://mojavopadagesit.weebly.com/uploads/1/3/5/3/135383036/fodavetotadur-xadesewilume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_60309462d9148.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/fumodubidaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_602096e3196e4.pdfIn PDF document text
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/5763506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_60206525308fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff506f5dc08c.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/121aa052f0c6.pdfIn PDF document text
    • https://fusagepewaliwe.weebly.com/uploads/1/3/5/3/135325652/9231519.pdfIn PDF document text
    • https://risidetumul.weebly.com/uploads/1/3/4/3/134320066/b7a339405a7be.pdfIn PDF document text
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/xerowig_xugukad.pdfIn PDF document text
    • https://kilazazemuvazu.weebly.com/uploads/1/3/1/4/131452741/3086980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_60419d6fea4ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ronuzexem.pbworks.com/f/66335026973.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144431244/how_to_identify_non_reducing_sugar.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144582768/78581431700.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144666378/xixitowakinage.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B42B 5048 bytes
SHA-256: de864018867484f28a2e6f944d4d718d653684f2b7079746540d65532601e36b
font_01_sfnt_off0001c561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C561 12416 bytes
SHA-256: d79041120daf8104a704da15691d9c86a4cc4b7e73adbd80964da57d81f6ec20
font_02_sfnt_off0001ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE6B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3