Malicious PDF — malware analysis report

Static analysis result for SHA-256 0267b31592112f99…

MALICIOUS

PDF

91.8 KB Created: 2021-02-16 21:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0494e8c2fc8e41fd37a897a408883722 SHA-1: e0adc54ff7edf31cfbfdb4c89d6d30d72fd15dc8 SHA-256: 0267b31592112f99d05c87ff6a1944c8c447c78121f085d552f6e306b1176c78
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. 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 embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=computer+programming+languages+pdf+in+bengali PDF link annotation
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/3256960.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/239676.pdfIn PDF document text
    • http://benunirudid.iblogger.org/5843918033.pdfIn PDF document text
    • http://wokadokifoxesav.22web.org/gofez.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/jijjiWg/arcade_games_online_play_now.pdfIn PDF document text
    • https://zetofenudewizir.weebly.com/uploads/1/3/5/3/135308120/xovurop_gepajotes_tixubap.pdfIn PDF document text
    • http://givepamodugag.22web.org/25755804180.pdfIn PDF document text
    • http://bokifov.iblogger.org/79161717473.pdfIn PDF document text
    • https://vobiromab.weebly.com/uploads/1/3/4/6/134653190/fifon.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/9619604.pdfIn PDF document text
    • https://numojenemisuben.weebly.com/uploads/1/3/2/3/132303045/9767748.pdfIn PDF document text
    • https://kebafilononuxo.weebly.com/uploads/1/3/1/3/131378837/9276508.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/79d3ca27f.pdfIn PDF document text
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/fddd483fa93182f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejusadesivuti.epizy.com/mark_carpio_music.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/nevowexenefaguxemi.pdfIn PDF document text
    • http://vudajerex.rf.gd/baadshah_1999_movie.pdfIn PDF document text
    • http://fapibudu.epizy.com/35934235515.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 4016 bytes
SHA-256: 403effb9c3c639814c148cac1e498e74bf8eb2f2dc2f9263a666fdeaf4abcb47
font_01_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 5404 bytes
SHA-256: a8e3bd507029f7e8b02ecbc1291d32e57f08e81dac7d9d06129b9857a8b201ce
font_02_sfnt_off00012788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 10536 bytes
SHA-256: 29fe497ae2843b7c21cf3e9913dae331fbec325dc1b9528d268298d45c35f8d2
font_03_sfnt_off00014bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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