Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d5c1c3b7d94c4f…

MALICIOUS

PDF

79.1 KB Created: 2021-02-23 04:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8c7a3b301718f33955382bfd08895684 SHA-1: e1412b3f6b0e254c1d5f2131e90764d35e439050 SHA-256: 91d5c1c3b7d94c4f626d53115153ee5534a938effb37573cf3088dcc618b3b9e
186 Risk Score

Malware Insights

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

This 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, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious content.

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://maypoin.ru/strik?utm_term=internet+service+providers+mumbai+maharashtra PDF link annotation
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/jitokox.pdfIn PDF document text
    • https://zegijavevezedoj.weebly.com/uploads/1/3/4/3/134309525/sepurujarik_dowirij_zetamu.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/16b2388591c55aa.pdfIn PDF document text
    • https://zojezuma.weebly.com/uploads/1/3/1/3/131382028/b0832366c.pdfIn PDF document text
    • http://ropufogesuzazeg.iblogger.org/15974854807.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/fa805a369.pdfIn PDF document text
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/5515113.pdfIn PDF document text
    • https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/c502af6.pdfIn PDF document text
    • https://terifebi.weebly.com/uploads/1/3/2/8/132815785/74d3e.pdfIn PDF document text
    • https://lojanoper.weebly.com/uploads/1/3/5/4/135400197/tevejemojur_zogud.pdfIn PDF document text
    • https://supadebev.weebly.com/uploads/1/3/2/7/132712355/e116edefb1.pdfIn PDF document text
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/pemefisuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varoximu/41482604647.pdfIn PDF document text
    • http://rolozaj.epizy.com/7720120804.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/simple_permutations_and_combinations_worksheet_answers.pdfIn PDF document text
    • http://jipuzekas.rf.gd/63876815969.pdfIn PDF document text
    • http://xedaxujaluzi.rf.gd/tovafake.pdfIn PDF document text
    • http://sitesiku.rf.gd/english_grammar_punctuation_worksheets_for_grade_3.pdfIn PDF document text
    • http://masosoxejonejov.rf.gd/modepovisutenuxidajimaw.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_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 5420 bytes
SHA-256: 30c42be19dd48ce123da12f9f206e3cdb6684f7402c4d0a68a3aa9693c1ae4b3
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10476 bytes
SHA-256: ce619b841ef41bb515869a96455dfb0c241a87fd6840bf3810dd39b18f604ddd

Open this report in the interactive analyzer, or submit your own file for analysis.