Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb25f7fc1c64bb65…

MALICIOUS

PDF

93.9 KB Created: 2021-03-10 17:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 63c37d8fcda762df60e5300835fe93dc SHA-1: 3801644531bfb9598d3b7698f68f958c3aaee601 SHA-256: bb25f7fc1c64bb6522ce3d43fcf5ec537d34fe64d1275b58aadccf0a89e5843b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and designed as a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=sexual+reproduction+and+asexual+reproduction+definition PDF link annotation
    • http://tiktoktop.design/xigefegewekekonos6dl.pdfIn PDF document text
    • http://mxbur.fun/123065220505p7a5.pdfIn PDF document text
    • https://bufagigakumeg.weebly.com/uploads/1/3/4/3/134313452/4fa7035bb4a.pdfIn PDF document text
    • https://rojogibolodo.weebly.com/uploads/1/3/0/7/130775817/gifap.pdfIn PDF document text
    • https://bepagiji.weebly.com/uploads/1/3/4/3/134352373/ee24c01.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/jedozuraroximopun.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/35b9707f8e6aae7.pdfIn PDF document text
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/jegojopafivit-velisovevimema-safok.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/nimit.pdfIn PDF document text
    • https://gobunelesivuwol.weebly.com/uploads/1/3/2/3/132303092/8917bde6a5005b.pdfIn PDF document text
    • http://inostrana.com/visualizer_3_templateho4a2.pdfIn PDF document text
    • https://tudadakamoziv.weebly.com/uploads/1/3/4/5/134596668/wodezawanokut-xasexosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f69d417-b54b-4f5f-858a-6e0047dbdbd1/solution_focused_therapy_founder.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/vinyl_adhesive_sheets_michaels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059fa29b-54c9-4e26-a564-b768b40b1b85/zabupajesewenivexijamunek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8668ea3-0c2b-4e8d-8a46-62624d576dec/norojofapovesozuvuvivazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17aeba51-0088-4618-a284-5ba2a78f1b56/mechanical_engineer_salary_in_canada_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/5064146948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5a5e70-c483-46ae-8911-c8ee37ca04ec/julius_caesar_play.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_off000130f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F9 5320 bytes
SHA-256: 418a4c74b4849c38e2f67d5a1117e5637b81b69b4388d07a45ad1b29748ee4ce
font_01_sfnt_off00014325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14325 11808 bytes
SHA-256: d242ef9ea37ee62f0120a3e4a825bdc3ef7c3c431667554daa94fb1874b50291